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Programming and Data Structures · Programming in C
Official IIT answer key · IIT Delhi · Audited Aug 2026
GATE CSE 2020 Q22 · NAT · 1 mark
#include <stdio.h>
int main() {
int a[4][5]={{1, 2, 3, 4, 5},
{6, 7, 8, 9, 10},
{11, 12, 13, 14, 15},
{16, 17, 18 , 19, 20}};
printf("%d
", *(*(a+**a+2)+3));
return(0);
}
The output of the program is _________.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 int main() int a[4][5]=1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18 , 19, 20; printf("%d ", *(*(a+**a+2)+3)); return(0); The output of the program is …
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Independent practice explanation verified by the GateAI team. GATE is conducted by the IITs; question text follows the official paper.