Explore topic-wise MCQs in C Programming.

This section includes 202 Mcqs, each offering curated multiple-choice questions to sharpen your C Programming knowledge and support exam preparation. Choose a topic below to get started.

101.

What will be the output of the following C code?
#include <stdio.h>
 void main()
 {
 int arr[5] = {101, 201, 301, 401, 501};
 int *q1 = arr;
 int *q2 = &q1;
 printf("%d", (**q2));
 }
A. Garbage value
B. Compilation Error
C. 101
D. 102
E. Same memory address
Answer» C. 101
Discussion
102.

What will be the output of the following C code?
#include <stdio.h>
 void main()
 {
 int array[4] = {11, 12, 13, 14};
 int *ptr1 = array;
 int *ptr2 = &ptr1;
 printf("%d", (**ptr2));
 }
A. 11
B. 12
C. 13
D. 14
E. Compilation Error
Answer» F.
Discussion
103.

What will be the output of the following C code?
 #include <stdio.h>
 void main()
 {
 int num = 14;
 int *ptr1 = &num;
 int **ptr2 = &ptr1;
 **ptr2 = 16;
 printf("%d n", num);
 }
A. Compilation Error
B. 14
C. Garbage value
D. 16
E. None of these
Answer» E. None of these
Discussion
104.

What will be the output of the following C code?
#include >stdio.h<
 void main()
 {
 int n = 15;
 int *ptr1 = &n;
 int **ptr2 = &ptr1;
 printf("%d %d %d n", n, *ptr1, **ptr1);
 }
A. Compilation Error
B. 15, 15, 15
C. Garbage value, Garbage value, Garbage value
D. Garbage value, 15, 15
E. None of these
Answer» B. 15, 15, 15
Discussion
105.

What will be the output of the following C code?
#include <stdio.h>
 void main()
 {
 int i = 51;
 int *ptr1 = &i;
 int **ptr2 = &ptr1;
 printf("%d %d %d n", i, *ptr1, **ptr2);
 }
A. 51, 51, Garbage value
B. Garbage value, Garbage value, Garbage value
C. 51, 51, 51
D. Compilation Error
E. None of these
Answer» D. Compilation Error
Discussion
106.

What will be the output of the following C code?
#include <stdio.h>
 void main()
 {
 char str[] = "WELCOME";
 str++;
 printf("%c n", *str);
 }
A. Compilation Error
B. W
C. L
D. Garbage value
E. None of these
Answer» B. W
Discussion
107.

What will be the output of the following C code?
#include <stdio.h>
 void main()
 {
 char *str = "SUJIT";
 char *ptr = str * 5;
 printf("%c t%c", *ptr, str[3]);
 }
A. S I
B. I S
C. Garbage value
D. Compilation Error
E. None of these
Answer» E. None of these
Discussion
108.

What will be the output of the following C code?
#include <stdio.h>
 void main()
 {
 char *str = "InterviewMania";
 char *ntr = "Mania";
 char *ptr = str + ntr;
 printf("%c t%c", *ptr, str[1]);
 }
A. InterviewMania
B. Mania
C. Compilation Error
D. I M
E. None of these
Answer» D. I M
Discussion
109.

Is the below declaration legal?
int* ((*N)())[12];
A. Undefined behaviour
B. True
C. False
D. Depends on the standard
E. None of these
Answer» D. Depends on the standard
Discussion
110.

What will be the output of the following C code?
#include <stdio.h>
 void main()
 {
 struct Employee
 {
 int Id;
 char Name[35];
 };
 struct Employee emp;
 emp.Id = 15;
 printf("%d", emp.Id);
 }
A. compilation Error
B. Garbage value
C. 15
D. Nothing
E. None of these
Answer» D. Nothing
Discussion
111.

What will be the output of the following C code?
#include <stdio.h>
 struct clothes
 {
 int size;
 char Brand_name[24];
 };
 void main()
 {
 clothes c;
 c.size = 36;
 printf("Peter England");
 }
A. Compilation Error
B. Garbage value
C. Peter England
D. Nothing
E. None of these
Answer» B. Garbage value
Discussion
112.

What will be the output of the following C code?
#include <stdio.h>
 struct car
 {
 int car_no = 12;
 char car_name[25];
 };
 void main()
 {
 struct car c;
 c.car_no = 10;
 printf("Audi");
 }
A. 10
B. Compilation Error
C. Audi
D. Garbage value
E. None of these
Answer» C. Audi
Discussion
113.

What will be the output of the following C code?
#include <stdio.h>
 struct student
 {
 int roll_no;
 char Name[35];
 }
 void main()
 {
 struct student stu;
 stu.roll_no = 10;
 printf("Ajit Kumar Gupta");
 }
A. Nothing
B. Ajit Kumar Gupta
C. 10
D. Garbage value
E. Compilation Error
Answer» F.
Discussion
114.

What will be the output of the following C code?
 #include <stdio.h>
 int main()
 {
 int num[5] = {11, 21, 31, 41, 51};
 int ptr[5];
 ptr = num;
 printf("%d n", ptr[2]);
 }
A. Undefined behaviour
B. Garbage value
C. Compilation Error
D. 51
E. None of these
Answer» D. 51
Discussion
115.

Comment on the following pointer declaration.
int *p, n;
A. p and n both are not pointers to integer
B. p is a pointer to integer, n may or may not be
C. p and n, both are pointers to integer
D. p is a pointer to integer, n is not
E. None of these
Answer» E. None of these
Discussion
116.

What will be the output of the following C code?
 #include <stdio.h>
 int *fun();
 int main()
 {
 int *ptr = fun();
 printf("%d n", *ptr);
 }
 int *fun()
 {
 int n = 12;
 return &n;
 }
A. Segmentation fault
B. Undefined behaviour
C. Compilation Error
D. 12
E. None of these
Answer» B. Undefined behaviour
Discussion
117.

What will be the output of the following C code?
#include <stdio.h>
 int *fun();
 int main()
 {
 int *ptr = fun();
 printf("%d n", *ptr);
 }
 int *fun()
 {
 int *p = (int*)malloc(sizeof(int));
 *p = 11;
 return p;
 }
A. Compilation Error
B. 11
C. Undefined behaviour
D. Segmentation fault/runtime crash since pointer to local variable is returned
E. None of these
Answer» C. Undefined behaviour
Discussion
118.

What will be the output of the following C code?
 #include <stdio.h>
 int main()
 {
 int num = 110;
 void *ptr = &num;
 printf("%f n", *(float*)ptr);
 return 0;
 }
A. 110
B. Undefined behaviour
C. Garbage value
D. Compilation Error
E. 0.000000
Answer» F.
Discussion
119.

What will be the output of the following C code?
#include <stdio.h>
 int main()
 {
 int n = 12;
 void *ptr = &n;
 printf("%d n", (int)*ptr);
 return 0;
 }
A. Compilation Error
B. Garbage value
C. 12
D. Nothing
E. None of these
Answer» B. Garbage value
Discussion
120.

What will be the output of the following C code?
#include <stdio.h>
 void fun(int*);
 int main()
 {
 int num = 10;
 fun((&num)++);
 }
 void fun(int *ptr)
 {
 printf("%d n", *ptr);
 }
A. Compilation Error
B. 113
C. Garbage value
D. Runtime Error
E. None of these
Answer» B. 113
Discussion
121.

What will be the output of the following C code?
#include <stdio.h>
 void main()
 {
 int var = 101;
 int *p = &var;
 printf("%d n", *p);
 }
A. 101
B. Compilation Error
C. Address of var
D. Garbage value
E. None of these
Answer» B. Compilation Error
Discussion
122.

What will be the output of the following C code?
#include <stdio.h>
 void main()
 {
 int var = 10;
 int *p = &15;
 printf("%p n", p);
 }
A. 10
B. 15
C. Garbage value
D. Compilation Error
E. None of these
Answer» E. None of these
Discussion
123.

What will be the output of the following C code?
#include <stdio.h>
 void main()
 {
 int n = 0;
 int *p = &n;
 printf("%p n", p);
 p++;
 printf("%p n ", p);
 }
A. Compilation Error
B. Different memory address
C. Garbage value
D. Same memory address
E. None of these
Answer» C. Garbage value
Discussion
124.

What will be the output of the following C code?
#include <stdio.h>
 int n = 0;
 void main()
 {
 int *const p = &n;
 printf("%p n", p);
 p++;
 printf("%p n ", p);
 }
A. Same memory address
B. Compilation Error
C. Different memory address
D. Garbage value
E. None of these
Answer» C. Different memory address
Discussion
125.

What will be the output of the following C code?
 #include <stdio.h>
 int num = 0;
 void main()
 {
 int *p = &num;
 printf("%p n", p);
 num++;
 printf("%p n ", p);
 }
A. Compilation Error
B. Same memory address
C. Different memory address
D. Varies
E. None of these
Answer» C. Different memory address
Discussion
126.

What will be the output of the following C code?
 #include <stdio.h>
 int main()
 {
 int num = 12;
 int *ptr = &num;
 foo(&ptr);
 printf("%d ", *ptr);
 printf("%d ", *ptr);
 }
 void foo(int **const ptr)
 {
 int k = 13;
 *ptr = &k;
 printf("%d ", **ptr);
 }
A. Undefined-value
B. 13 13 13
C. Compilation Error
D. Segmentation fault/code-crash
E. None of these
Answer» C. Compilation Error
Discussion
127.

What will be the output of the following C code?
#include <stdio.h>
 void fun(int m, int n)
 {
 int temp = m;
 m = n;
 n = temp;
 }
 void main()
 {
 int s = 16, t = 15;
 fun(s, t);
 printf("%d %d n", s, t);
 }
A. 16 16
B. 15 15
C. 15 16
D. 16 15
E. Compilation Error
Answer» E. Compilation Error
Discussion
128.

What will be the output of the following C code?
#include <stdio.h>
 void fun(int *ptr)
 {
 int k = 0;
 for(k = 0; k < 4; k++)
 printf("%d ", ptr[k]);
 }
 void main()
 {
 int n[5] = {16, 15, 13, 21};
 fun(&n);
 }
A. Compilation Error
B. 16 15 13 21
C. 21 13 15 16
D. Runtime Error
E. None of these
Answer» C. 21 13 15 16
Discussion
129.

What will be the output of the following C code?
#include <stdio.h>
 void fun(int *ptr1, int *ptr2)
 {
 int temp = *ptr1; *ptr1 = *ptr2; *ptr2 = temp;
 }
 void main()
 {
 int m = 10, n = 12;
 fun(&m, &n);
 printf("%d %d n", m, n);
 }
A. Compilation Error
B. 10 12
C. 12 10
D. Garbage value
E. None of these
Answer» D. Garbage value
Discussion
130.

What will be the output of the following C code?
#include <stdio.h>
 void main()
 {
 char *ptr1= "Interview Mania";
 char *ptr2 = ptr1;
 printf("%c %c", ptr2[0], ptr1[10]);
 }
A. Interview Mania
B. Compilation Error
C. I M
D. M I
E. None of these
Answer» D. M I
Discussion
131.

What will be the output of the following C code?
 #include <stdio.h>
 void main()
 {
 char *ptr1 = "Interview Mania";
 char *ptr2 = ptr1;
 printf("%p %p", ptr2, ptr1);
 }
A. Compilation Error
B. Same memory address is printed
C. Different memory address is printed
D. Nothing
E. None of these
Answer» C. Different memory address is printed
Discussion
132.

What will be the output of the following C code?
#include <stdio.h>
 void main()
 {
 int arr[4] = {11, 12, 13, 14};
 int *ptr = arr;
 printf("%p t%p", ptr, arr);
 }
A. Different memory address is printed
B. Compilation Error
C. Nothing
D. Same memory address is printed
E. None of these
Answer» E. None of these
Discussion
133.

What will be the output of the following C code?
#include <stdio.h>
 void function(int m, int n)
 {
 printf("%d %d n", m, n);
 }
 void main()
 {
 int s = 16, t = 15;
 function(s);
 }
A. Garbage value
B. Runtime Error
C. 16 15
D. 15 16
E. Compilation Error
Answer» F.
Discussion
134.

What will be the output of the following C code?
#include <stdio.h>
 int main()
 {
 int A[5] = {10, 20, 30, 40, 50};
 int *ptr = A + 2;
 printf("%d %d n", ptr[-1], A[*ptr]);
 }
A. 20 0
B. Compilation Error
C. 20 Garbage value
D. 0 20
E. None of these
Answer» B. Compilation Error
Discussion
135.

What will be the output of the following C code?
 #include <stdio.h>
 int main()
 {
 int array[5] = {11, 12, 13, 14, 15};
 int *ptr = array + 7;
 printf("%d n", ptr[-3]);
 }
A. 11
B. 12
C. 13
D. 14
E. 15
Answer» F.
Discussion
136.

What are the elements present in the array of the following C code?
int num[4] = {10};
A. 10, 10, 10, 10
B. 0, 0, 0, 0
C. 10, 0, 0, 0
D. 0, garbage value, garbage value, garbage value
E. 10, garbage value, garbage value, garbage value
Answer» D. 0, garbage value, garbage value, garbage value
Discussion
137.

What will be the output of the following C code?
#include <stdio.h>
 int main()
 {
 const int num[5] = {11, 21, 31, 41, 51};
 int *ptr;
 ptr = num + 3;
 *ptr = 50;
 printf("%d n", num[3]);
 }
A. 11
B. 21
C. 31
D. 51
E. 50
Answer» F.
Discussion
138.

What will be the output of the following C code?
#include <stdio.h>
 int main()
 {
 int num[6] = {6, 7, 8, 9, 10};
 printf("%d n", *num);
 }
A. 10
B. 9
C. 8
D. 7
E. 6
Answer» F.
Discussion
139.

What will be the output of the following C code?
#include <stdio.h>
 void fun( int[] );
 int main()
 {
 int array[5] = {10, 20, 30, 40, 50};
 fun(array);
 printf("%d ", array[2]);
 }
 void fun(int ptr[5])
 {
 int n = 100;
 ptr = &n;
 printf("%d ", ptr[0]);
 }
A. 100 100
B. 10 100
C. 100 10
D. 30 100
E. 100 30
Answer» F.
Discussion
140.

What will be the output of the following C code?
#include <stdio.h>
 void main()
 {
 char *str= "WATCH";
 char *ptr = str;
 printf("%c %c", 1[ptr], str[1]);
 }
A. A A
B. WATCH
C. Compilation Error
D. Garbage value
E. None of these
Answer» B. WATCH
Discussion
141.

What will be the output of the following C code?
 #include <stdio.h>
 void main()
 {
 char *str= "WELCOME";
 char *ptr = str;
 printf("%c %c", *(ptr + 2), str[0]);
 }
A. WELCOME
B. Compilation Error
C. L W
D. W L
E. None of these
Answer» D. W L
Discussion
142.

Comment on the following C statement.
const int *p;
A. You can change the pointer as well as the value pointed by it
B. You May or maynot change the value pointed by p
C. You cannot change the pointer p itself
D. You cannot change the value pointed by p
E. None of these
Answer» E. None of these
Discussion
143.

What will be the output of the following C code?
#include <stdio.h>
 int main()
 {
 int *p, n = 15;
 p = &n;
 *p += 10;
 printf("%d, %d n", *p, n);
 }
A. 15
B. 10
C. 25, 25
D. 15 10
E. None of these
Answer» D. 15 10
Discussion
144.

What will be the output of the following C code?
#include <stdio.h>
 int main()
 {
 int n = 101;
 int *ptr = &n;
 fun(&ptr);
 printf("%d ", *ptr);
 }
 void fun(int *const *ptr)
 {
 int k = 100;
 *ptr = &k;
 printf("%d ", **ptr);
 }
A. 100 100
B. 101 100
C. Garbage value
D. Compilation Error
E. None of these
Answer» E. None of these
Discussion
145.

What will be the output of the following C code?
 #include <stdio.h>
 int main()
 {
 int n = 58, *ptr = &n;
 function(&ptr);
 printf("%d ", *ptr);
 return 0;
 }
 void function(int **ptr)
 {
 int k = 12;
 *ptr = &k;
 printf("%d ", **ptr);
 }
A. Undefined behaviour
B. 58
C. Segmentation fault/code crash
D. 12 12
E. None of these
Answer» E. None of these
Discussion
146.

What will be the output of the following C code?
#include <stdio.h>
 void fun(int*);
 int main()
 {
 int n = 14, *ptr = &n;
 fun(ptr++);
 }
 void fun(int *ptr)
 {
 printf("%d n", *ptr);
 }
A. 0.000000
B. Compilation Error
C. 14.000000
D. Runtime Error
E. None of these
Answer» B. Compilation Error
Discussion
147.

What will be the output of the following C code?
#include <stdio.h>
 int main()
 {
 int num = 45, *ptr = &num;
 function(&num);
 printf("%d ", *ptr);
 }
 void function(int *ptr)
 {
 int L = 20;
 ptr = &L;
 printf("%d ", *ptr);
 }
A. 20 45
B. 20
C. 45
D. 45 20
E. Compilation Error
Answer» B. 20
Discussion
148.

What will be the output of the following C code?
#include <stdio.h>
 void fun(int*);
 int main()
 {
 int n = 101, *ptr = &n;
 fun(ptr++);
 }
 void fun(int *ptr)
 {
 printf("%d n", *ptr);
 }
A. Garbage value
B. 101
C. Segmentation fault
D. Compilation Error
E. None of these
Answer» C. Segmentation fault
Discussion
149.

What will be the output of the program if the size of pointer is 4-bytes? #include int main() { printf("%d, %d\n", sizeof(NULL), sizeof(")); return 0; }

A. 2, 1
B. 2, 2
C. 4, 1
D. 4, 2
Answer» D. 4, 2
Discussion
150.

What will be the output of the program ?_x000D_ #include_x000D_ _x000D_ void fun(void *p);_x000D_ int i;_x000D_ _x000D_ int main()_x000D_ {_x000D_ void *vptr;_x000D_ vptr = &i;_x000D_ fun(vptr);_x000D_ return 0;_x000D_ }_x000D_ void fun(void *p)_x000D_ {_x000D_ int **q;_x000D_ q = (int**)&p;_x000D_ printf("%d\n", **q);_x000D_ }

A. Error: cannot convert from void** to int**
B. Garbage value
C. 0
D. No output
Answer» D. No output
Discussion