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key words and reserved words

summary

    Each programming language has its own set of key words or reserved words.

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key words or reserved words

    Each computer programming language has its own set of key words or reserved words.

    A key word is a word that has special meaning in a programming language, such as commands.

    A reserved word is a word that has special meaning in a programming language and that can not be used for any other purpose.

    In most programming languages the two terms are interchangeable, even if the language specification only uses one of the two terms.

    There are languages without any reserved words, such as PL/I. In Pl/I the meaning is determined by context, so it is possible to have a variable named IF and a procedure named CALL. Very confusing and to be avoided.

    In some case-sensitive languages, such as C it is possible to intriduce similar confusion. Only the all lower case word if is a reserved word. The similar IF, If, and iF are all valid identifiers for variables, functions, etc.

    The reason that PL/I allows the use of key words as identifier names is because of the very large number of reserved words (it is a huge language). This frees up name space for other purposes and relieves programmers of having to memorize the entire list of key words, especially for key words that the programmer might never use. Nonetheless, it is still confusing.

    Keywords and reserved words may be a valid identifier.

    The following chart can be used to identify the key words or reserved words in the programming language you are learning.
    All Ada entries with colored backgrounds are reserved words.
    All BASIC entries with colored backgrounds are ANSI words. All other BASIC entries are platform specific.
    All C entries with colored backgrounds are reserved words. All other C entires are library functions and a few other items (some operators).
    All COBOL entries with colored backgrounds are reserved words.
    All Pascal entries with colored backgrounds are reserved words. All other Pascal entries are pre-defined types, standard functions, standard procedures, or options.
    All PL/I entries are key words. PL/C (a collegiate subset of PL/I) has reserved words. These PL/C reserved words are indicated by PL/C reserved
    All Python entries with colored backgrounds are operators or reserved words. All other Python entries are built-in types, built-in functions, sys modules, or built-in methods.

Ada	BASIC	C	COBOL	Pascal	PL/I	Python
					A format item
abort
abs	ABS	abs		abs	ABS built-in function	abs function
abstract
accept			ACCEPT
access			ACCESS
	ACS AC ARCOS	acos			ACOS built-in function
	ACSD
	ARCG
					%ACTIVATE %ACT preprocessor statement
			ACTUAL
+	+	+	ADD	+	+ ADD built-in function	+
					ADDBUFF option of ENVIRONMENT attribute
		&	ADDRESS		ADDR built-in function
			ADVANCING
			AFTER
aliased
					ALIGNED attribute
all			ALL		ALL built-in function, option of PUT statement option of DEFAULT statement	all function
					ALLOCATE statement PL/C reserved word ALLOC statement
					ALLOCATION ALLOCN built-in function
			ALPHABETIC
			ALSO
			ALTER
			ALTERNATE
and	AND A.	&&	AND	and	&	and
					ANY built-in function	any function
	APPEND					append collections module
						appendleft collections module
			ARE
			AREA		AREA condition, attribute
			AREAS
					ARG option of NOMPA, NOMAPIN, and NOMAPOUT options of the OPTIONS attribute
		argv				argv sys attribute
array				array
			ASCENDING
	ASC ASCII				ASCII option of ENVIRONMENT attribute
	ASN ARCSIN	asin			ASIN built-in function
	ASND
	ASNG
		asm			ASSEMBLER ASM option of OPTIONS attribute/option
						assert
			ASSIGN
					ASSOCIATE option of ENVIRONMENT attribute
at	AT A. @		AT
	ATN ATAN ARCTAN	atan		arctan	ATAN built-in function
		atan2
	ATND				ATAND built-in function
	ATANG
					ATANH built-in function
		atof
		atoi
		atol
					ATTENTION ATTN condition
			AUTHOR
	AUTO
		auto			AUTOMATIC AUTO attribute
Ada	BASIC	C	COBOL	Pascal	PL/I	Python
					B format item
					BACKWARD BKWD option of ENVIRONMENT attribute
					BACKWARDS attribute, option of OPEN statement
	BASE
					BASED attribute
						basestring type
			BEFORE
begin		{		begin	BEGIN statement PL/C reserved word
			BEGINNING
					BINARY BIN attribute, built-in function
					BIT attribute, built-in function
			BLANK
					BLKSIZE option of ENVIRONMENT attribute
			BLOCK
body
					BOOL built-in function	bool type
				boolean
			BOTTOM
	BREAK	break				break
		brk
					BUFFERED BUF attribute
					BUFFERS option of ENVIRONMENT attribute	buffer type
					BUILTIN attribute
					BUFND option of ENVIRONMENT attribute
					BUFNI option of ENVIRONMENT attribute
					BUFOFF option of ENVIRONMENT attribute
					BUFSP option of ENVIRONMENT attribute
			BY		BY clause of DO statement PL/C reserved word
	BYE
					BY NAME BYNAME option of assignment statement
Ada	BASIC	C	COBOL	Pascal	PL/I	Python
					C format item
	CALL		CALL		CALL statement, option of INITIAL attribute PL/C reserved word
						callable function
		calloc
case		case		case	SELECT statement
			CD
	CDBL
		ceil			CEIL built-in function
			CF
		cfree
			CH
	CHAIN
	CHANGE
	CH	char		chr	CHAR built-in function	chr function
			CHARACTER
			CHARACTERS	char	CHARACTER CHAR attribute
					CHECK condition PL/C reserved word statement
	CHR$ CHR CHAR CHAR$
	CINT
						class
						classmethod type
	CLEAR CLR
						clear collections module
		clearerr
	CLG
	CLK$ CLK
	CLOAD
			CLOCK-UNITS
			CLOSE		CLOSE statement PL/C reserved word
	CLRDOT
	CLS
					CMDCHN option of ENVIRONMENT attribute
						cmp function
			COBOL		COBOL option of ENVIRONMENT attribute, option of OPTIONS attribute/option
	CODE		CODE
			CODE-SET
						coerce function
					COLBIN option of ENVIRONMENT attribute
			COLLATING
	COLOR
			COLUMN		COLUMN COL format item
			COMMA
	COMMON COM
			COMMUNICATION
			COMP
						compile function
					COMPILETIME built-in function
					COMPLETION built-in function, pseudo-variable
					COMPLEX CPLX data attribute, built-in function, pseudo-variable	complex type
			COMPUTATIONAL
			COMPUTE
					CONDITION COND condition, attribute
			CONFIGURATION
					CONJG built-in function
					CONNECTED CONN attribute
					CONSECUTIVE option on ENVIRONMENT attribute
constant				const
			CONTAINS
	CONT CON CO C.	continue				continue
			CONTROL
			CONTROLS
					%CONTROL preprocessor statement
					CONTROLLED CTL attribute
					CONVERSION CONV condition
			COPY		COPY option of GET statement	copy copy module
			CORE
			CORR
			CORRESPONDING
	COS	cos		cos	COS built-in function
	COSD				COSD built-in function
	COSG
	COSH	cosh			COSH built-in function
	COUNT				COUNT built-in function
					COUNTER built-in function
	CSAVE
	CSNG
					CTLASA option of ENVIRONMENT attribute
					CTL360 option of ENVIRONMENT attribute
	CUR
			CURRENCY
					CURRENTSTORAGE CSTG built-in function
Ada	BASIC	C	COBOL	Pascal	PL/I	Python
	D				D option of ENVIRONMENT attribute
	DATA DAT D.		DATA		DATA STREAM I/O transmission mode
					DATAFIELD built-in function
			DATE		DATE built-in function
			DATE-COMPILED
			DATE-WRITTEN
			day
					DB option of ENVIRONMENT attribute
			DE
					%DEACTIVATE %DEACT preprocessor statement
			DEBUG-CONTENTS
			DEBUG-ITEM
			DEBUG-LINE
			DEBUG-NAME
			DEBUG-SUB-1
			DEBUG-SUB-2
			DEBUG-SUB-3
			DEBUGGING
					DECIMAL DEC attribute, built-in function
			DECIMAL-POINT
			DECLARATIVES
declare					DECLARE statement PL/C reserved word DCL statement PL/C reserved word
					%DECLARE %DCL preprocessor statement
						deepcopy copy module
	DEF
		default			DEFAULT DEF statement
	DEFDBL
					DEFINED DEF attribute	def
	DEFINT
	DEFSNG
	DEFSTR
	DEG
						delattr function
delay					DELAY statement
	DELETE DEL		DELETE		DELETE statement PL/C reserved word	del
			DELIMITED
			DELIMITER
			DEPENDING
						deque collections type
			DESCENDING
					DESCRIPTORS option of DEFAULT statement
			DESTINATION
	DET
			DETAIL
delta
						dict type
digits	DIGITS
	DIM				DIM built-in function
						dir function
					DIRECT attribute
			DISABLE
			DISPLAY		DISPLAY statement
						displayhook sys attribute
				dispose	FREE PL/C reserved word
/	/	/	DIVIDE	div	/ DIVIDE built-in function	/
			DIVISION
						divmod function
do		do		do	DO statement PL/C reserved word
					%DO preprocessor statement
	DOT
		double
				dowith
			DOWN
				downto
	DRAW
	DSP
			DUPLICATES
			DYNAMIC
Ada	BASIC	C	COBOL	Pascal	PL/I	Python
	E				E format item
	EDIT				EDIT STREAM I/O transmission mode
			EGI
else	ELSE	else	ELSE	else	ELSE clause of IF statement PL/C reserved word	else
					%ELSE clause of %IF statement
elsif						elif
			EMI
					EMPTY built-in function
			ENABLE
end	END	}	END	end	END statement PL/C reserved word
					%END preprocessor statement
				eof	ENDFILE condition
			ENDING
				eoln
			END-OF-PAGE		ENDPAGE condition
			ENTER
entry		entry			ENTRY statement, attribute PL/C reserved word
		enum				enumerate type
			ENVIRONMENT		ENVIRONMENT ENV attribute
			EOF	eof	ENDFILE condition
	EQ		EQUAL
	ERASE
					ERF built-in function
					ERFC built-in function
	ERL ERRL
	ERR ERRN
	ERROR		ERROR		ERROR condition
			ESI
						eval function
					EVENT option of CALL, READ, WRITE, REWRITE, and DELETE statements, attribute
			EVERY
	EXAM		EXAMINE
exception			EXCEPTION			except
						excepthook sys attribute
	EXCHANGE
						exc_info sys attribute
					EXCLUSIVE EXCL attribute
						exec
						execfile function
exit	EXIT	exit	EXIT		EXIT statement PL/C reserved word	exit sys attribute
		_exit
	EXP	exp		exp	EXP built-in function	pow function
			EXTEND			extend collections module
						extendleft collections module
					EXTENTNUMBER option of ENVIRONMENT attribute
		extern			EXTERNAL EXT attribute
Ada	BASIC	C	COBOL	Pascal	PL/I	Python
					F option of ENVIRONMENT attribute, format item
		fabs
					FB option of ENVIRONMENT attribute
					FBS option of ENVIRONMENT attribute
		fclose
			FD
		feof
		ferror
	FETCH				FETCH statement
		fflush
		fgetc
		fgets
			FILE	file	FILE attribute, OPTION of GET, PUT, READ, WRITE, OPEN, DELETE, and CLOSE statements, specification of RECORD I/O statements	file type
			FILE-CONTROL
			FILE-LIMIT
			FILE-LIMITS
					FILESEC option of ENVIRONMENT attribute
	FILL
			FILLER
						filter function
			FINAL
						finally
					FINISH condition
			FIRST
	FIX
					FIXED attribute, built-in function
					FIXEDOVERFLOW FOFL condition
	FLASH
		float			FLOAT attribute	float type
					FLOAT built-in function
		flor			FLOOR built-in function
	FLOW				FLOW statement PL/C reserved word
	FMT
	FN
	FNEND
			FOOTING
		fopen				open
for	FOR F.	for	FOR	for	DO	for
					FORMAT statement PL/C reserved word
		fortran			FORTRAN option of OPTIONS attribute/option
				forward
		fprintf
		fputc
		fputs
	FRAC
	FRE FREE
		free		dispose	FREE statement
		fread
			FROM		FROM option of WRITE or REWRITE statements	from
						frozenset type
					FS option of ENVIRONMENT attribute
		fscanf
		fseek
		ftell
function				function	FUNCTION option of ENVIRONMENT attribute
		fwrite
Ada	BASIC	C	COBOL	Pascal	PL/I	Python
					G option of ENVIRONMENT attribute
	GE
			GENERATE
generic					GENERIC attribute
					GENKEY option of ENVIRONMENT attribute
	GET			get	GET statement PL/C reserved word
						getattr function
		getc
		getchar
						getdefaultencoding sys attribute
						getrefcount sys attribute
						getrecursionlimit sys attribute
						_getframe sys attribute
			GIVING
						global
						globals function
	GO				GO statement PL/C reserved word
	GOSUB GOS.
	GOSUB-OF
goto	GOTO GO TO GOT G.	goto	GO	goto	GO TO GOTO statement PL/C reserved word
					%Go TO %GOTO preprocessor statement
	GOTO-OF
	GR
	GRAD
			GREATER
			GROUP
	GT
Ada	BASIC	C	COBOL	Pascal	PL/I	Python
					HALT statement
						hasattr function
						hash function
					HBOUND built-in function
			HEADING
						hex function
					HIGH built-in function
					HIGHINDEX option of ENVIRONMENT attribute
			HIGH-VALUE
			HIGH-VALUES
	HLIN-AT
	HOME
Ada	BASIC	C	COBOL	Pascal	PL/I	Python
			IDENTIFICATION			id function
if	IF	if	IF	if	IF statement PL/C reserved word	if
					%IF preprocessor statement
	IF-GOTO IF-G. IF-GOT
	IF-LET
	IF-THEN IF-THE IF-T.
					IGNORE option of READ statement
					IMAG built-in function, pseudo-variable
	IMAGE
		#import				import reserved __import__ function
in			IN	in	IN option of ALLOCATE and FREE statements	in
					%INCLUDE preprocessor statement
	INDEX	index	INDEX		INDEX built-in function
					INDEXAREA option of ENVIRONMENT attribute
			INDEXED		INDEXED option of ENVIRONMENT attribute
					INDEXMULTIPLE option of ENVIRONMENT attribute
			INDICATE
					INITIAL INIT attribute
			INITIATE
	INKEY$
	INP
	INPUT IN. I.		INPUT	input	INPUT attribute, option of OPEN statement	input function
	INPUTLINE
			INPUT-OUTPUT
	INPUT$
	INPUT1
			INSPECT
			INSTALLATION
	INSTR
	INT I.	int		integer		int type
					INTER option of OPTIONS attribute
interface
					INTERNAL INT attribute	intern function
			INTO		INTO option of READ statement
			INVALID
	INVERSE
			I-O
			I-O-CONTROL
					IRREDUCIBLE IRRED attribute
is			IS			is
		isalnum
		isalpha
		isascii
		iscntrl
		isdigit
						isinstance function
		islower
		isprint
		ispunct
		isspace
					iSUB dummy variable of DEFINED attribute
						issubclass function
		isupper
		itoa
						iter function
Ada	BASIC	C	COBOL	Pascal	PL/I	Python
			JUST
			JUSTIFIED
Ada	BASIC	C	COBOL	Pascal	PL/I	Python
			KEY		KEY condition, option of READ, DELETE, and REWRITE statements
					KEYED attribute, option of OPEN statement
					KEYFROM option of WRITE and LOCATE statement
					KEYLENGTH option of ENVIRONMENT attribute
					KEYLOC option of ENVIRONMENT attribute
			KEYS
	KEY$ KEY
					KEYTO option of READ statement
Ada	BASIC	C	COBOL	Pascal	PL/I	Python
			LABEL	label	LABEL attribute
						lambda
			LAST
					LBOUND built-in function
	LE
			LEADING
					LEAVE statement, option of ENVIRONMENT attribute
			LEFT
	LEFT$ LEFT
	LEN L.		LENGTH		LENGTH built-in function	len function
			LESS
	LET
					LIKE attribute
			LIMIT
			LIMITS
limited
	LIN
			LINAGE
			LINAGE-COUNTER
			LINE		LINE format item, option of PUT statement
			LINE-COUNTER
	LINEINPUT LINPUT
					LINENO built-in function
			LINES
					LINESIZE option of OPEN statement
			LINKAGE
						list type
	LIST LIS LI L.				LIST STREAM I/O transmission mode
	LLIST
	LOAD
						locals function
					LOCATE statement
			LOCK
	LOG LOGE LN	log		ln	LOG built-in function
					LOG2 built-in function
	LOG10 LGT				LOG10 built-in function
		long				long type
loop
					LOW built-in function
			LOW-VALUE
			LOW-VALUES
	LPRINT
	LT
Ada	BASIC	C	COBOL	Pascal	PL/I	Python
		main			MAIN option of PROCEDURE staatement, option of OPTIONS attribute/option
		malloc
	MAN
						map function
	MAT CON
	MAT IDN
	MAT INPUT
	MAT INV
	MAT PRINT
	MAT READ
	MAT TRN
	MAT ZER
	MAT =
	MAT +
	MAT -
	MAT *
	MAX				MAX built-in function	max function
						maxint sys attribute
					MEDIUM option of ENVIRONMENT attribute
	MEM M.		MEMORY
			MERGE
			MESSAGE
	MID$ MID
	MIN				MIN built-in function	min function
mod	MOD	%		mod	MOD built-in function
			MODE
			MODULES			modules sys attribute
			MOVE
			MULTIPLE
*	*	*	MULTIPLY	*	* MULTIPLY built-in function	*
Ada	BASIC	C	COBOL	Pascal	PL/I	Python
					NAME condition
			NATIVE
					NCP option of ENVIRONMENT attribute
	NE
			NEGATIVE
new	NEW NE N.			new
	NEXT NEX N.		NEXT
				nil
			NO		NO PL/C reserved word
					NOCHECK condition prefix identifier, PL/C reserved word statement
					NOCONVERSION NOCONV condition prefix identifier
					NOFEED option of ENVIRONMENT attribute
					NOFIXEDOVERFLOW NOFOFL condition prefix identifier
	NOFLOW				NOFLOW statement PL/C reserved word
					NOFORMAT option of %CONTROL statement
					NOLABEL option of ENVIRONMENT attribute
					NOLOCK option of READ statement
					NOMAP option of OPTIONS attribute/option
					NOMAPIN option of OPTIONS attribute/option
					NOMPAOUT option of OPTIONS attribute/option
					NOOPTIMIZE complier option
					NOOVERFLOW NOOFL condition prefix identifier
					%NOPRINT preprocessor listing control statement
					NORESCAN option of %ACTIVATE statement
	NORMAL
					NOSIZE condition prefix condition prefix identifier
					NOSTRINGRANGE NOSTRG condition prefix identifier
					NOSTRINGSIZE NOSTRZ condition prefix
					NOSUBSCRIPTRANGE NOSUBRG condition prefix identifier
not	NOT		NOT	not	¬	not
					NOTAPEMK option of ENVIRONMENT attribute
			NOTE
					%NOTE preprocessor statement
	NOTRACE
					NOUNDERFLOW NOUFL condition prefix identifier
					NOWRITE option of ENVIRONMENT attribute
					NOZERODIVIDE NOZDIV condition prefix identifier
null				nil	NULL built-in function
					NULLo built-in function
	NUM
	NUM$
			NUMBER
			NUMERIC
Ada	BASIC	C	COBOL	Pascal	PL/I	Python
						object type
			OBJECT-COMPUTER
			OCCURS
						oct function
				odd
of			OF	of
			OFF
					OFFSET attribute, built-in function
					OFLTRACKS option of ENVIRONMENT attribute
			OMITTED
					OMR option of ENVIRONMENT attribute
			ON		ON statement PL/C reserved word
					ONCHAR built-in function, pseudo-variable
					ONCODE built-in function
					ONCOUNT built-in function
	ON ERROR GOTO ON ERR GOTO
					ONFILE built-in function
	ON-GOSUB ON-GOS.
	ON-GOTO ON-GOT ON-G.
					ONKEY built-in function
					ONLOC built-in function
					ONSOURCE built-in function, pseudo-variable
					ONSYSLOG option of OPTIONS option of PROCEDURE statement
			OPEN		OPEN statement PL/C reserved word	open type
	OPTION
			OPTIONAL
					OPTIONS option of PROCEDURE statement, option of ENTRY statement, attribute
or	OR	||	OR	or	|	or
				ord		ord function
					ORDER option of PROCEDURE and BEGIN statements
			ORGANIZATION
others
					OTHERWISE OTHER clause of SELECT group
out	OUT
			OUTPUT	output	OUTPUT attribute, option of OPEN statement
			OVERFLOW		OVERFLOW OFL condition
overriding
Ada	BASIC	C	COBOL	Pascal	PL/I	Python
					P format item
				pack
package
				packed
			PAGE	page	PAGE format item, option of PUT statement
					%PAGE preprocessor listing control statement
			PAGE-COUNTER
					PAGESIZE option of OPEN statement
					PARMSET built-in function
						pass
					PASSWORD option of ENVIRONMENT attribute
						path sys attribute
	PAUSE
	PDL
	PEEK
					PENDING condition
			PERFORM
			PF
			PH
	PI
			PIC PICTURE		PICTURE PIC attribute
	PIN
						platform sys attribute
					PLIRETV built-in function
	PLOT
			PLUS
	POINT
			POINTER		POINTER PTR attribute, built-in function
	POKE
					POLY built-in function
	POP					pop collections module
						popleft collections module
	POS		POSITION		POSITION POS attribute
			POSITIVE
		pow				pow function
		power
pragma
	PRECISION				PRECISION PREC built-in function
				pred
	PRINT PRI P.				PRINT attribute, option of OPEN statement	print
					%PRINT preprocessor listing control statement
	PRINT AT PRINT @ P.A.
		printf
			PRINTING
	PRINT USING
					PRIORITY option of CALL statement
					PRIORITY built-in function, pseudo-variable
private
procedure			PROCEDURE	procedure	PROCEDURE statement PL/C reserved word PROC statement PL/C reserved word
					%PROCEDURE %PROC preprocessor statement
			PROCEDURES
			PROCEED
			PROCESSING
					PROD built-in function
			PROGRAM	program
						property type
			PROGRAM-ID
protected
						ps1 sys attribute
						ps2 sys attribute
				put	PUT statement PL/C reserved word
		putc
		putchar
Ada	BASIC	C	COBOL	Pascal	PL/I	Python
			QUEUE
			QUOTE
			QUOTES
		qsort
Ada	BASIC	C	COBOL	Pascal	PL/I	Python
					R format item, option of ENVIRONMENT attribute
	RAD RADIAN
raise						raise
	RND	rand	RANDOM
	RANDOMIZE RANDOM RAN
range					RANGE option of DEFAULT statement	range function
						raw_input function
					RCE option of ENVIRONMENT attribute
			RD
	READ REA. REA		READ	read	READ statement PL/C reserved word
				readln
				real	REAL attribute
					REAL built-in function, pseudo-variable
		realloc
	RECALL
			RECEIVE
record		struct	RECORD	record	RECORD attribute, condition, option of OPEN statement, condition
			RECORDS
					RECSIZE option of ENVIRONMENT attribute
					RECURSIVE option of PROCEDURE statement
			REDEFINES
						reduce function
					REDUCIBLE RED attribute
			REEL
					REENTRANT option of OPTIONS option of PROCEDURE statement/small>
					REFER option of BASED attribute
			REFERENCES
					REGIONAL option of ENVIRONMENT attribute
		register
			RELATIVE
			RELEASE		RELEASE statement
						reload function
rem
	REM REMARK
			REMAINDER
			REMARKS
			REMOVAL
renames			RENAMES
	RENUMBER RENUM REN
					REORDER option of PROCEDURE and BEGIN statements
				repeat	REPEAT built-in function, option of DO statement
	REPEAT$
			REPLACING
					REPLY option of DISPLAY statement
			REPORT
			REPORTING
			REPORTS
						repr function
requeue
				reset	REREAD option of ENVIRONMENT attribute and CLOSE statement
			RERUN
					RESCAN preprocessor option of %ACTIVATE statement
			RESERVE
	RESET R.		RESET	reset	REREAD option of ENVIRONMENT attribute and CLOSE statement
	RESTORE REST. RES
	RESUME
					RETCODE option of OPTIONS attribute
return	RETURN RET. RET R.	return	RETURN		RETURN statement PL/C reserved word	return
					RETURNS attribute, option of PROCEDURE and ENTRY and %PROCEDURE statements
					REUSE option of ENVIRONMENT attribute
reverse
			REVERSED			reversed type
					REVERT statement PL/C reserved word
			REWIND		REWIND option of ENVIRONMENT attribute
				rewrite	REWRITE statement PL/C reserved word
			RF
			RH
			RIGHT
	RIGHT$ RIGHT
		rindex
	RND
						rotate collections module
			ROUNDED	round	ROUND built-in function	round function
	RUN RU R.		RUN
Ada	BASIC	C	COBOL	Pascal	PL/I	Python
			SAME
					SAMEKEY built-in function
	SAVE
					SCALARVARYING option of ENVIRONMENT attribute
		scanf
	SCRATCH SCR
	SCRN
			SD
			SEARCH
			SECTION
			SECURITY
			SEEK
	SEG$ SEG
			SEGMENT
			SEGMENT-LIMIT
select			SELECT		SELECT statement
			SEND
			SENTENCE
separate			SEPARATE
			SEQUENCE
			SEQUENTIAL		SEQUENTIAL SEQL attribute
	SET S.		SET	set	SET option of ALLOCATE, LOCATE, and READ statements	set type
						setattr function
	SETDOT
						setdefaultencoding sys attribute
						setprofile sys attribute
						setrecursionlimit sys attribute
						setrace sys attribute
	SGN
		short
	SGN		SIGN		SIGN built-in function
					SIGNAL statement PL/C reserved word
	SIN	sin		sin	SIN built-in function
	SIND				SIND built-in function
	SING
	SINH	sinh			SINH built-in function
					SIS option of ENVIRONMENT attribute
			SIZE		SIZE condition
		sizeof
					SKIP format item, option of GET and PUT statements, option of ENVIRONMENT attribute
					%SKIP preprocessor statement
	SKIPF
	SLEEP
						slice type
					SNAP option of ON statement, option of PUT statement
			SORT		SORT built-in function	sorted function
			SORT-MERGE
			SOURCE
			SOURCE-COMPUTER
	SPACES SPACE SPA SPC		SPACE SPACES
			SPECIAL-NAMES
		sprintf
		sqr		sqr
	SQR SQRT	sqrt		sqrt
		srand
		sscanf
					STACKER option of ENVIRONMENT attribute
			STANDARD
			STANDARD-1
			START
					STATEMENT option of %PROCEDURE statement
		static			STATIC attribute	staticmethod type
			STATUS		STATUS built-in function, pseudo-variable
		stderr				stderr sys attribute
		stdin				stdin sys attribute
		stdout				stdout sys attribute
	STEP STE ST S.
	STOP STO ST. S.		STOP		STOP statement PL/C reserved word
					STORAGE STG built-in function
	STORE
	STR$					str type
		strcat			||
		strcmp
		strcpy
					STREAM attribute, option of OPEN statement
					STRING built-in function, pseudo-variable	str type
					STRING option of GET and PUT statements
	STRING$ STRING STR					str
					STRINGRANGE STRG condition
					STRINGSIZE STRZ condition
		strlen
		strncmp
		strncpy
		struct
	STUFF
					iSUB dummy variable of DEFINED attribute
					SUBSCRIPTRANGE SUBRG condition
			SUB-QUEUE-1
			SUB-QUEUE-2
			SUB-QUEUE-3
					SUBSTR built-in function, pseudo-variable
-	-	-	SUBTRACT	-	-	-
subtype
				succ
			SUM		SUM built-in function	sum function
						super type
			SUPPRESS
	SWAP
		switch
			SYMBOLIC
			SYNC
synchronized			SYNCHRONIZED
					SYSIN name of standard system input file
					SYSIPT name of standard DOS system input logical unit name
					SYSLST name of standard DOS system output logical unit name
	SYSTEM SYS				SYSPCH name of standard DOS system output logical unit name
					SYSPRINT name of standard system output file
					SYSTEM option of ON statement, option of DEFAULT statement
Ada	BASIC	C	COBOL	Pascal	PL/I	Python
	TAB T.
			TABLE
tagged
			TALLY
			TALLYING
	TAN	tan			TAN built-in function
	TAND				TAND built-in function
	TANG
	TANH	tanh			TANH built-in function
	TAPPEND
			TAPE
task					TASK attribute, option of PROCEDURE statement
					TASK option of CALL statement
			TERMINAL
terminate			TERMINATE
				test
	TEXT		TEXT
			THAN
then	THEN THE T.			then	THEN clause of IF statement PL/C reserved word
					%THEN clause ofIF statement
			THROUGH
			THRU
	TIME TIM TI		TIME		TIME built-in function
			TIMES
	TIMES$ IT$
					TITLE option of OPEN statement
	TLOAD
			TO	to	TO clause of DO statement PL/C reserved word
		tolower
	TOP		TOP
					TOTAL option of ENVIRONMENT attribute
		toupper
					TP option of ENVIRONMENT attribute
	TRACE
						tracebacklimit sys attribute
	TRACE OFF
	TRACE ON
			TRAILING
					TRANSIENT attribute
					TRANSLATE built-in function
					TRANSMIT condition
					TRKOFL option of ENVIRONMENT attribute
	TROFF
	TRON
				trunc	TRUNC built-in function
						try
	TSAVE
						tuple type
type		typedef	TYPE	type		type type
Ada	BASIC	C	COBOL	Pascal	PL/I	Python
					U option of ENVIRONMENT attribute
					UNALIGNED UNAL attribute
					UNBUFFERED UNBUF attribute, option of OPEN statement
					UNDEFINEDFILE UNDF condition
					UNDERFLOW UFL condition
		ungetc
						unichr function
						unicode type
		union
			UNIT
		unlink
					UNLOAD option of ENVIRONMENT attribute
					UNLOCK statement
				unpack
		unsigned
					UNSPEC built-in function, pseudo-variable
			UNSTRING
until	UNTIL		UNTIL	until	UNTIL option of DO statement
			UP
					UPDATE attribute, option of OPEN statement
			UPON
			USAGE
use			USE
			USING
	USR USER
Ada	BASIC	C	COBOL	Pascal	PL/I	Python
					V option of ENVIRONMENT attribute
	VAL
			VALUE		VALUE option of DEFAULT statement
			VALUES
				var
					VARIABLE attribute
	VARPTR
						vars function
			VARYING		VARYING VAR attribute
					VB option of ENVIRONMENT attribute
					VBS option of ENVIRONMENT attribute
					VERIFY built-in function, option of ENVIRONMENT attribute
						version sys attribute
	VLIN-AT
	VTAB
		void
					VOLSEQ option of ENVIRONMENT attribute
					VS option of ENVIRONMENT attribute
					VSAM option of ENVIRONMENT attribute
Ada	BASIC	C	COBOL	Pascal	PL/I	Python
	WAIT				WAIT statement
when			WHEN		WHEN clause of SELECT group, used with GENERIC attribute
while	WHILE	while		while	WHILE clause of DO statement PL/C reserved word	while
with			WITH	with		with 2.5 or later
			WORDS
			WORKING-STORAGE
			WRITE	write	WRITE statement PL/C reserved word
				writeln
					WRTPROT option of ENVIRONMENT attribute
Ada	BASIC	C	COBOL	Pascal	PL/I	Python
					X format item
	XDRAW
xor	XOR XRA
						xrange type
Ada	BASIC	C	COBOL	Pascal	PL/I	Python
						yield
Ada	BASIC	C	COBOL	Pascal	PL/I	Python
			ZERO
			ZEROES ZEROS
					ZERODIVIDE ZDIV condition
						zip function

Python

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