C Programming - MCQ Practice Questions
C questions in placement tests and university exams are rarely about syntax alone. Most of what you will find here is output prediction, pointer arithmetic, arrays and strings, structures and unions, storage classes, recursion, and file handling. The explanations walk through memory behaviour step by step, which is usually where the confusion sits rather than in the code itself.
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What is the size of a pointer in a 64-bit system?
How does free() handle a NULL pointer?
What is the result of: int x = 5; int *p = &x; int *q = p; if p == q?
What happens with: int arr[10]; int *p = arr; *p = 5; printf("%d", arr[0]);?
What is the output of the following code?
int x = 10;
int *p = &x;
int **q = &p;
printf("%d", **q);
Consider the declaration: const int *p; and int * const q;
Which statement is TRUE?
What is the primary issue with this code?
int *p;
*p = 10;