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GATE CSE 2024 Session 2 Q13: Output when function arguments are evaluated right to left

Question

Consider the following C program. Assume parameters to a function are evaluated from right to left.

#include <stdio.h>

int g(int p) { printf("%d", p); return p; }
int h(int q) { printf("%d", q); return q; }

void f(int x, int y) {
  g(x);
  h(y);
}

int main() {
  f(g(10),h(20));
}

Which one of the following options is the CORRECT output of the above C program?

Try it: multiple choice: exactly one correct option

Select one option
Wrong answer costs 1/3 mark in GATE.
Show answer and explanation

Answer: A (official GATE 2024 final answer key)

Concept used: Argument evaluation order decides the order of side effects (prints) before the call.

First step: Right to left: h(20) prints first, then g(10); inside f, g(x) and h(y) print in program order.

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Source: official GATE 2024 Session 2 CS question paper and final answer key, organised by IISc Bangalore. Question paper · Answer key

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