To answer this question, we need to understand the syntax and rules of using conditional expressions with an IF-THEN-ELSE-ENDIF construction.
The IF-THEN-ELSE-ENDIF construction is used in programming languages to make decisions based on a condition. It follows the syntax:
IF condition THEN
statement(s)
ELSE
statement(s)
ENDIF
The condition in the IF statement is a conditional expression that evaluates to either true or false.
Let's go through each option to understand why it can or cannot be used with an IF-THEN-ELSE-ENDIF construction:
A. STEP.RC NE 8 - This option can be used with an IF-THEN-ELSE-ENDIF construction because it is a valid conditional expression. It checks if the value of the STEP.RC variable is not equal to 8.
B. ABEND = FALSE - This option can be used with an IF-THEN-ELSE-ENDIF construction because it is a valid conditional expression. It checks if the value of the ABEND variable is equal to false.
C. STEP.CC = U4038 - This option cannot be used with an IF-THEN-ELSE-ENDIF construction because it is missing the comparison operator. The correct syntax for this condition would be STEP.CC EQ U4038. Therefore, this option is incorrect.
D. STEP.RUN EQ TRUE - This option can be used with an IF-THEN-ELSE-ENDIF construction because it is a valid conditional expression. It checks if the value of the STEP.RUN variable is equal to true.
The correct answer is C. STEP.CC = U4038. This option is incorrect because it is missing the comparison operator.
Therefore, the conditional expression that cannot be used with an IF-THEN-ELSE-ENDIF construction is C. STEP.CC = U4038.