GATE CS 2025 Set 1 — Question 34
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Programming & Data Structures → C Programming → Functions & Recursion
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Question
#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;
}
Correct answer
25 to 25
Solution
The step-by-step execution of the program is as follows:
1.Variable Initialization: In the
main function, two integer variables are declared and initialized: and . An integer pointer is also declared.2.Pointer Assignment: The statement
z = &a; assigns the memory address of to the pointer . Thus, points to .3.Function Call: The function
foo(z, b) is called. - The formal parameter (an
int*) receives the address of (the value of ). - The formal parameter (an
int) receives the value of , which is .
foo, the statement *p = x; dereferences the pointer and assigns the value of to that memory location. Since points to , this operation updates the value of to .5.Printing Output: After the function returns, the statement
printf("%d", a); in main prints the current value of . Since was modified by the function call, the output is .Continue learning with Success Tracker
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