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Programming and Data Structures · Programming in C
Official IIT answer key · IIT Guwahati · Audited Aug 2026
GATE CSE 2025 Set 1 Q34 · NAT · 1 mark
#include <stdio.h>
void foo(int *p, int x){
*p=x;
}
int main(){
int *z;
int a = 20, b = 25;
z = &a;
foo(z,b);
printf("%d",a);
return 0;
}
The output of the given C program is ________. (Answer in integer)Key concept
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Topic notes
In GATE CS, Programming in C is tested extensively through rigorous code tracing, pointer mechanics, and fundamental semantics rather than high-level syntax trivia. Questions emphasize pointer arithmetic and multidimensional array decay, storage classes (especially static local variables), evaluation order, side effects of increment/decrement operators, parameter passing mechanisms (pass-by-value vs pass-by-reference), and recursive program state tracking. The topic features a nearly balanced split between NAT and MCQ items across 1-mark and 2-mark categories, demanding precise, bug-free execution traces without a compiler.
Full Programming in C guide →#include void foo(int *p, int x) *p=x; int main() int *z; int a = 20, b = 25; z = &a; foo(z,b); printf("%d",a); return 0; The output of the given C program is … (Answer in integer)
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