Programming and Data Structures · Programming in C
Official IIT answer key · IIT Roorkee · Audited Aug 2026
GATE CSE 2026 Set 1 Q39 · MCQ · 2 marks
head.
struct node{
int elt;
struct node *next;
};
int getListSize (struct node *head)
{
if( E1 ) return 1;
return E2;
}
Which one of the following options gives the correct replacements for the expressions E1 and E2?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 code snippet in C language that computes the number of nodes in a non-empty singly linked list pointed to by the pointer variable head . struct node int elt; struct node *next; ; int getListSize (struct node *head) if( E1 ) return 1; return E2; Which one of the following options gives the correct replacements for the expressions E1 and E2 ?
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.