GATE CS 2024 Set 2 — Question 13

MCQ+1 / -0.33MediumFunctions & RecursionC ProgrammingProgramming & Data Structures

Programming & Data Structures → C Programming → Functions & Recursion

Last updated 20 August 2026

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?

Correct answer (A) 20101020 Solution The problem specifies that function parameters are evaluated from right to left. In the main function, the call is f(g(10), h(20)) . 1. Evaluate arguments of f (Right to Left): First, h(20) is evaluated. It executes printf("%d", 20), printing 20, and returns 20. Next, g(10) is evaluated. It executes printf("%d", 10), printing 10, and returns 10. At this point, the output sequence is 2010 . 2. Execute function f(10, 20) : Inside f, g(x) is called with x=10 . It prints 10 . Then, h(y) is called with y=20 . It prints 20 . Combining all printed values in order, the final output is 20101020 . Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

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Correct answer (A) 20101020 Solution The problem specifies that function parameters are evaluated from right to left. In the main function, the call is f(g(10), h(20)) . 1. Evaluate arguments of f (Right to Left): First, h(20) is evaluated. It executes printf("%d", 20), printing 20, and returns 20. Next, g(10) is evaluated. It executes printf("%d", 10), printing 10, and returns 10. At this point, the output sequence is 2010 . 2. Execute function f(10, 20) : Inside f, g(x) is called with x=10 . It prints 10 . Then, h(y) is called with y=20 . It prints 20 . Combining all printed values in order, the final output is 20101020 .

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