Computer Knowledge - MCQ Practice Questions

What is the output of the following C code? int x = 5; printf("%d", x++);

Which of the following is the correct syntax to declare a pointer in C?

What will be the size of the following array in bytes? char arr[10];

What is the purpose of the 'void' keyword in C?

What is the output of the following C code? int a = 10, b = 20; int c = (a > b) ? a : b; printf("%d", c);

What does the strlen() function return?

What is the output of the following C code? int x = 5; int y = ++x + x++; printf("%d", y);

What is the difference between scanf() and gets() functions?

What is the correct way to allocate memory for a single integer using malloc()?

What is the output of the following C code? int x = 5; int *ptr = &x; printf("%d %d", *ptr, x);

What happens when you use the strcpy() function without bounds checking?

What is the output of the following C code? int arr[] = {10, 20, 30}; int *ptr = arr; printf("%d", *(ptr + 1));

Which of the following correctly describes the scope of a static variable declared inside a function?

What will be the output of the following C code? int x = 10; int y = 20; int z = x < y ? x++ : y++; printf("%d %d %d", x, y, z);

What is the output of the following C code? #include <stdio.h> int main() { int a = 5; printf("%d %d %d", a++, ++a, a); return 0; }

What is the correct way to declare a constant pointer to a constant integer?

Consider the following C code. What will be printed? int arr[3][3] = {{1,2,3}, {4,5,6}, {7,8,9}}; int *ptr = (int *)arr; printf("%d", *(ptr + 5));

What is the output of the following C code? #define MAX 5 int main() { int arr[MAX]; printf("%d", sizeof(arr)/sizeof(arr[0])); return 0; }

What is the difference between struct and union in C?

Which header file is required to use the printf() function in C?