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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Consider: #define DOUBLE(x) (2*(x))
int main() { int arr[DOUBLE(5)]; ... }
What is the size of the array?
What will be the preprocessed output of the following code?
#define SQUARE(x) x*x
int result = SQUARE(5+3);
What does the __VA_ARGS__ preprocessor feature allow in variadic macros?
What is the output of the following code?
#define STR(x) #x
printf(STR(Hello World));
Consider this preprocessor code:
#define CONCAT(a,b) a##b
int CONCAT(var,1) = 10;
What is the actual variable name created?
Consider the following preprocessor directives:
#define MAX 100
#define MIN 50
#undef MAX
#define MAX 200
int main() {
printf("%d", MAX);
return 0;
}
What will be the output of this program?