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Programming and Data Structures · Programming in C
Official IIT answer key · IIT Guwahati · Audited Aug 2026
GATE CSE 2025 Set 2 Q33 · NAT · 1 mark
int x=126, y=105;do { if(x>y) x=x-y; else y=y-x;} while(x!=y);printf("%d",x);
The output of the given C code segment is ________ . (Answer in integer)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 →int x=126, y=105; do if(x>y) x=x-y; else y=y-x; while(x!=y); printf("%d",x); The output of the given C code segment is … (Answer in integer)
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