Multiple choice technology programming languages

To pass a copy of the identifier to the subprogram --- code can be used?

  1. (a) CALL . . . BY CONTENT literal

  2. (b) CALL . . . BY CONTENT identifier

  3. (c) CALL . . . BY CONTENT ADDRESS OF identifier

  4. (d) CALL . . . BY CONTENT ADDRESS OF identifier
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

To solve this question, the user needs to know the different ways to pass parameters to a subprogram in programming languages.

The options in the question are using the "CALL" statement to pass a copy of the identifier to a subprogram. The CALL statement is used to transfer control to a subprogram (procedure or function) and pass arguments, if any.

Now, let's go through each option and explain why it is right or wrong:

A. (a) CALL . . . BY CONTENT literal: This option is incorrect because it passes a literal value to the subprogram, not an identifier. The "BY CONTENT" phrase specifies that the value is passed by value, which means a copy of the value is passed to the subprogram.

B. (b) CALL . . . BY CONTENT identifier: This option is correct because it passes a copy of the identifier (variable name) to the subprogram. The "BY CONTENT" phrase specifies that the value of the identifier is passed by value, which means a copy of the value is passed to the subprogram.

C. (c) CALL . . . BY CONTENT ADDRESS OF identifier: This option is incorrect because it passes the address of the identifier to the subprogram, not a copy of the value. The "BY CONTENT ADDRESS OF" phrase specifies that the address of the identifier is passed by value, which means a copy of the address is passed to the subprogram.

D. (d) CALL . . . BY CONTENT ADDRESS OF identifier: This option is incorrect because it is the same as option C, which passes the address of the identifier to the subprogram.

Therefore, the correct answer is:

The Answer is: B. (b) CALL . . . BY CONTENT identifier

AI explanation

CALL ... BY CONTENT identifier is correct. BY CONTENT passes a temporary copy of the identifier's current value into the subprogram's linkage; any changes the subprogram makes only affect that copy, leaving the caller's original data untouched. This is distinct from BY REFERENCE, which passes the actual address and allows the subprogram to modify the caller's data.

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