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Programming and Data Structures · Programming in C
Official IIT answer key · IIT Delhi · Audited Aug 2026
GATE CSE 2020 Q46 · NAT · 2 marks
int fun1(int n) {
static int i = 0;
if (n > 0) {
++i;
fun1(n-1);
}
return(i);
}
int fun2(int n) {
static int i = 0;
if (n > 0) {
i = i + fun1(n);
fun2(n-1);
}
return(i);
}
The return value of fun2(5) 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 fun1(int n) static int i = 0; if (n > 0) ++i; fun1(n-1); return(i); int fun2(int n) static int i = 0; if (n > 0) i = i + fun1(n); fun2(n-1); return(i); The return value of fun2(5) is …
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