Next: , Previous: SCALE, Up: Intrinsic Procedures


8.224 SCAN — Scan a string for the presence of a set of characters

Description:
Scans a STRING for any of the characters in a SET of characters.

If BACK is either absent or equals FALSE, this function returns the position of the leftmost character of STRING that is in SET. If BACK equals TRUE, the rightmost position is returned. If no character of SET is found in STRING, the result is zero.

Standard:
Fortran 95 and later, with KIND argument Fortran 2003 and later
Class:
Elemental function
Syntax:
RESULT = SCAN(STRING, SET[, BACK [, KIND]])
Arguments:

STRING Shall be of type CHARACTER.
SET Shall be of type CHARACTER.
BACK (Optional) shall be of type LOGICAL.
KIND (Optional) An INTEGER initialization expression indicating the kind parameter of the result.

Return value:
The return value is of type INTEGER and of kind KIND. If KIND is absent, the return value is of default integer kind.
Example:
          PROGRAM test_scan
            WRITE(*,*) SCAN("FORTRAN", "AO")          ! 2, found 'O'
            WRITE(*,*) SCAN("FORTRAN", "AO", .TRUE.)  ! 6, found 'A'
            WRITE(*,*) SCAN("FORTRAN", "C++")         ! 0, found none
          END PROGRAM

See also:
INDEX intrinsic, VERIFY