Skip to content
GATEiit

GATE CSE 2022 Q21: Output of a C program using pointers to an int and an array

Question

What is printed by the following ANSI C program?

#include<stdio.h>
int main(int argc, char *argv[])
{
    int x = 1, z[2] = {10, 11};
    int *p = NULL;
    p = &x;
    *p = 10;
    p = &z[1];
    *(&z[0] + 1) += 3;
    printf("%d, %d, %d\n", x, z[0], z[1]);
    return 0;
}

Try it: multiple choice: exactly one correct option

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

Answer: D (official GATE 2022 final answer key)

Concept used: Writing through a pointer changes the variable it points to; &z[0] + 1 is the address of z[1].

First step: *p = 10 runs while p points to x; then *(&z[0] + 1) += 3 updates z[1].

Full step-by-step solution

Detailed working, common mistakes and linked mock tests will be available with a free GATEiit account. Log-in is coming soon.

Share this question

WhatsAppDownload image

Source: official GATE 2022 CS question paper and final answer key, organised by IIT Kharagpur. Question paper · Answer key

More Programming and Data Structures PYQs

PracticePractise Programming and Data Structures questions →Full paperAll GATE CSE 2022 questions →