C Programming - MCQ Practice Questions

For char arr[5] = {'a', 'b', 'c', 'd', 'e'}, is this a valid string?

Consider the following code: char str[] = "HELLO"; int len = 0; while(str[len] != '\0') { len++; } printf("%d", len); What will be the output?

Which operator is used to get the address of a variable in C?

What will be the size of a pointer variable on a 64-bit system?

What is a NULL pointer?

What is the output? int a = 5; int *p = &a; int q = &p; printf("%d", q);

What happens when you increment a pointer? int arr[5] = {1,2,3,4,5}; int *p = arr; p++;

Which of the following is NOT a valid pointer declaration?

What is the output? int x = 10, y = 20; int *p = &x; int *q = &y; p = q; printf("%d", *p);

Identify the output: char *str = "Hello"; printf("%c", *str);

What is the difference between *p++ and (*p)++?

What will be printed? int arr[] = {1, 2, 3}; int *p = arr; printf("%d", *(p+2));

What is a wild pointer?

What is the output? int *p = NULL; if(p) printf("Not NULL"); else printf("NULL");

Which of the following correctly allocates memory for 10 integers?

What is a dangling pointer?

What does the following code do? int *p = (int*)malloc(sizeof(int)); *p = 5; free(p); p = NULL;

What will be the output? int arr[] = {10, 20, 30}; int *p = arr; printf("%d %d", arr[1], *(p+1));

Which statement is true about void pointers?

What is the output? int x = 50; int *p = &x; int *q = p; q = NULL; printf("%d", *p);