Xbasic

IF ... THEN ... ELSE, ELSEIF

Syntax

IF Logical_Expression1 [ THEN ] [ Statements1 ] [ ELSEIF Logical_Expression2 [ THEN ] [ Statements2 ]] ... [ ELSEIF Logical_ExpressionN [ THEN ] [ StatementsN ]] [ ELSE [ Statements ]] END IF

Arguments

Logical_Expression1: An expression that evaluates to .T. (TRUE) or .F. (FALSE).
Logical_Expression2 ... Logical_ExpressionN: Optional. Expressions that evaluates to .T. (TRUE) or .F. (FALSE).

Description

Executes the statements for the first logical expression that evaluates to TRUE.

Discussion

IF ... THEN ... ELSE is a conditional control structure, executing the statements for the first logical expression that evaluates to TRUE. If no expression evaluates to TRUE, statements supplied after the else clause are executed. IMPORTANT: The then and else clauses must be the last words on the line. SELECT ... CASE, IIF(), CASE()

Associate a grade with a score. Any score below 60 is an F.

FUNCTION test_grade as C(score as N)
    if score >= 90 then
        grade = "A"
    elseif score >= 80 then
        grade = "B"
    elseif score >= 70 then
        grade = "C"
    elseif score >= 60 then
        grade = "D"
    else
        grade = "F"
    end if
    test_grade = grade
end FUNCTION

ENDIF command

The ENDIF keyword can be used interchangeably with the END IF command.