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Programming and Data Structures · Programming in C
Official IIT answer key · IIT Bombay · Audited Aug 2026
GATE CSE 2021 Set 2 Q23 · NAT · 1 mark
int SomeFunction(int x, int y)
{
if ((x == 1) || (y == 1)) return 1;
if (x == y) return x;
if (x > y) return SomeFunction(x - y, y);
if (y > x) return SomeFunction(x, y - x);
}
The value returned by SomeFunction(15, 255) 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 ANSI C function: int SomeFunction(int x, int y) if ((x == 1) || (y == 1)) return 1; if (x == y) return x; if (x > y) return SomeFunction(x - y, y); if (y > x) return SomeFunction(x, y - x); The value returned by SomeFunction(15, 255) is …
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.