Programming and Data Structures · Programming in C
Official IIT answer key · IIT Guwahati · Audited Aug 2026
GATE CSE 2025 Set 2 Q19 · MCQ · 1 mark
#include <stdio.h>
void stringcopy(char *, char *);
int main() {
char a[30] = "@#Hello World!";
stringcopy(a, a + 2);
printf("%s
", a);
return 0;
}
void stringcopy(char *s, char *t) {
while(*t)
*s++ = *t++;
}
Which ONE of the following will be the output of the program?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 →Consider the following C program: #include void stringcopy(char *, char *); int main() char a[30] = "@#Hello World!"; stringcopy(a, a + 2); printf("%s ", a); return 0; void stringcopy(char *s, char *t) while(*t) *s++ = *t++; Which ONE of the following will be the output of the program?
Topic-wise GATE CS PYQs with verified steps
Independent practice explanation verified by the GateAI team. GATE is conducted by the IITs; question text follows the official paper.