Programming and Data Structures · Programming in C
Official IIT answer key · IIT Delhi · Audited Aug 2026
GATE CSE 2020 Q48 · NAT · 2 marks
int tob(int b, int* arr){
int i;
for(i=0; b>0; i++){
if(b%2) arr[i]=1;
else arr[i]=0;
b = b/2;
}
return(i);
}
int pp(int a,int b) {
int arr[20];
int i, tot = 1, ex, len;
ex = a;
len = tob(b,arr);
for(i=0; i<len; i++){
if(arr[i]==1)
tot = tot * ex;
ex = ex * ex;
}
return(tot);
}
The value returned by pp(3,4) 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 functions. int tob(int b, int* arr) int i; for(i=0; b>0; i++) if(b%2) arr[i]=1; else arr[i]=0; b = b/2; return(i); int pp(int a,int b) int arr[20]; int i, tot = 1, ex, len; ex = a; len = tob(b,arr); for(i=0; i The value returned by pp(3,4) is …
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