Statement: Conditionally executes one statement based on the value of a logical expression. (This statement was called a logical IF statement in FORTRAN 77.)
Syntax
When an IF statement is executed, the logical expression is evaluated first. If the value is true, the statement is executed. If the value is false, the statement is not executed and control transfers to the next statement in the program.
Compatibility
CONSOLE STANDARD GRAPHICS QUICKWIN GRAPHICS WINDOWS DLL LIB
See Also: IF Construct, Execution Control
Examples
The following examples show valid IF statements:
IF (J.GT.4 .OR. J.LT.1) GO TO 250
IF (REF(J,K) .NE. HOLD) REF(J,K) = REF(J,K) * (-1.5D0)
IF (ENDRUN) CALL EXIT
The following shows another example:
USE DFPORT
INTEGER(4) istat, errget
character(inchar)
real x
istat = getc(inchar)
IF (istat) errget = -1
...
!
IF (x .GT. 2.3) call new_subr(x)
...