Program Control Statements

Intel® Fortran Compiler Classic and Intel® Fortran Compiler Developer Guide and Reference

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ID 767251

Date 7/13/2023

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Program Control Statements

The following table lists statements that affect program control.

Statements
Name	Description
CALL	Transfers control to a subroutine.
CASE	Within a SELECT CASE construct, marks a block of statements that are executed if an associated value matches the SELECT CASE expression.
CASE DEFAULT or CLASS DEFAULT	Identifies the block of statements to be executed in a SELECT CASE construct if the value of the expression does not match any of the CASE selectors, or in a SELECT TYPE construct if the dynamic type of the selector does not match the type of any of the TYPE IS or CLASS IS statements.
CLASS IS	Within a SELECT TYPE construct, marks a block of statements that are executed if the type or dynamic type of an expression matches the type of the CLASS IS expression.
CONTINUE	Often used as the target of GOTO or as the terminal statement in a DO loop; performs no operation.
CYCLE	Advances control to the end statement of a DO loop; the intervening loop statements are not executed.
DO	Marks the beginning of a loop construct. Statements through and including the ending statement may be executed repeatedly.
DO CONCURRENT	Marks the beginning of a DO CONCURRENT construct. The order of executions of iterations of a DO CONCURRENT construct are indeterminate.
DO WHILE	Evaluates statements in the DO WHILE loop, through and including the ending statement, until a logical condition becomes .FALSE..
ELSE	Marks an optional branch in an IF construct.
ELSE IF	Marks an optional branch in an IF construct.
ELSEWHERE	Marks an optional branch in a WHERE construct.
END	Marks the end of a program unit. Execution of the END [PROGRAM] statement of the main program initiates normal termination for the image that executes it.
END DO	Marks the end of a series of statements in a DO, DO CONCURRENT, or DO WHILE construct.
END FORALL	Marks the end of a series of statements following a block FORALL statement.
END IF	Marks the end of a series of statements following a block IF statement.
END SELECT	Marks the end of a SELECT CASE or SELECT TYPE statement.
END WHERE	Marks the end of a series of statements following a block WHERE statement.
ERROR STOP	Initiates error termination for all images.
EXIT	Terminates execution of a DO loop or other construct. Execution continues with the first statement that follows the construct.
FAIL_IMAGE	Causes the image that executes it to execute no more statements and stop participating in program execution.
FORALL	Indicates a loop construct where the output from one iteration cannot change the input to another.
GOTO	Transfers control to a specified part of the program.
IF	Controls conditional execution of other statements.
PAUSE	Suspends program execution and, optionally, executes operating-system commands.
SELECT CASE	Transfers program control to a block of statements, determined by the value of an expression.
SELECT TYPE	Transfers the program to a block of statements, determined by the dynamic type of an expression.
STOP	Initiates normal termination for the image that executes the statement.
TYPE IS	Within a SELECT TYPE construct, marks a block of statements that are executed if the type or dynamic type of an expression matches the type of the TYPE IS expression.
WHERE	Controls conditional execution of array assignments and elemental function calls.

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Intel® Fortran Compiler Classic and Intel® Fortran Compiler Developer Guide and Reference

Program Control Statements