SCAN(STRING, SET, BACK, KIND)

Purpose

Scan a string for any one of the characters in a set of characters.

Class

Elemental function

Argument type and attributes

STRING

An INTENT(IN) character.

SET

An INTENT(IN) character with the same kind type parameter as STRING.

BACK (optional)

An INTENT(IN) logical.

KIND (optional)

An INTENT(IN) integer. The actual argument corresponding to KIND must be a constant expression.

Result type and attributes

• An integer.
• If KIND is present, the KIND type parameter is that specified by the value of KIND; otherwise, the KIND type parameter is that of default integer type.

Result value

• Case (i): If BACK is absent or is present with the value .FALSE. and if STRING contains at least one character that is in SET, the value of the result is the position of the leftmost character of STRING that is in SET.
• Case (ii): If BACK is present with the value .TRUE. and if STRING contains at least one character that is in SET, the value of the result is the position of the rightmost character of STRING that is in SET.
• Case (iii): The value of the result is zero if no character of STRING is in SET or if the length of STRING or SET is zero.