C Programming Multiple Choice Question - Functions And Pointers

This section focuses on the "Functions And Pointers" of the C programming. These Multiple Choice Questions (mcq) should be practiced to improve the C programming skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

1. The keyword used to transfer control from a function back to the calling function is

A. switch
B. goto
C. return
D. exit

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2. What is the default return type if it is not specified in function definition?

A. void
B. int
C. float
D. short int

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3. The default parameter passing mechanism is

A. Call by value
B. call by reference
C. call by value result
D. None

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4. Pick the correct statements.
I. The body of a function should have only one return statement
II. The body of a function may have many return statements.
III. function can return only one value to the calling environment.
IV. If return statement is omitted, then the function does its job but returns no value to the calling environment.

A. I and II
B. I and III
C. II and III
D. II anf IV

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5. Functions can return structure in c?

A. TRUE
B. FALSE
C. May Be
D. Can't Say

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6. Forward declaration is absolutely necessary

A. If a function returns a non-integer quantity
B. If the function call precedes its definition
C. If the function call precedes its definition and the function returns a non integer quantity
D. None of the above

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7. In C, what is the meaning of following function prototype with empty parameter list

void fun()
{
   /* .... */
}

A. Function can only be called without any parameter
B. Function can be called with any number of parameters of any types
C. Function can be called with any number of integer parameters.
D. Function can be called with one integer parameter.

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8. A pointer is

A. A variable that stores address of an instruction
B. A variable that stores address of other variable
C. A keyword used to create variables
D. None of these

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9. The reason for using pointers in a Cprogram is

A. Pointers allow different functions to share and modify their local variables.
B. To pass large structures so that complete copy of the structure can be avoided.
C. Pointers enable complex "linked" data structures like linked lists and binary trees.
D. All of the above

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10. How can you write a[i][j][k][l] in equivalent pointer expression?

A. (((***(a+i)+j)+k)+l)
B. ((**(*(a+i)+j)+k)+l)
C. (*(*(*(a+i)+j)+k)+l)
D. *(*(*(*(a+i)+j)+k)+l)

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11. What is wild pointer?

A. Pointer which is wild in nature
B. Pointer which has no value.
C. Pointer which is not initialized
D. None

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12. Address stored in the pointer variable is of type __________.

A. Integer
B. Float
C. Array
D. Character

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13. In order to fetch the address of the variable we write preceding _________ sign before variable name.

A. Percent(%)
B. Comma(,)
C. Ampersand(&)
D. Asteric(*)

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14. Comment on this const int *ptr;

A. You cannot change the value pointed by ptr
B. You cannot change the pointer ptr itself
C. Both (a) and (b)
D. You can change the pointer as well as the value pointed by it

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15. Choose the best one - prior to using a pointer variable

A. It should be declared.
B. It should be initialized
C. It should be both declared and initialized.
D. None of the above.

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16. Which of the following statements are correct about the given program?

#include <stdio.h>
int main()
{
    printf("%p", main());
    return 0;
}

A. Prints garbage value infinite times
B. Error
C. Runs infinite times without printing anything
D. None of the above

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17. What is the output of this program?

#include <stdio.h>
void fun(int a, ...)
{
    printf("%d ", a);
}
 
int main()
{
    fun(1,2,3,4);
    fun(5,6,7,8,9);
    return 0;
}

A. 1 5
B. 2 5
C. 5 1
D. Compilation Error

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18. What is the meaning of using static before function declaration?

		   
static int demo(int a, int b)
{
    return (a + b);
}

A. Access to static functions is restricted to the file where they are declared
B. Static means nothing, sum() is same without static keyword.
C. Function need not to be declared before its use
D. None of the above

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19. What is the output of this program?

		   
#include <stdio.h>
int demo()
{
  static int i = 0;  
  printf("%d ",i++);
}
int main()
{
  for(int j = 0 ; j < 5 ; j++ )
  {
      demo();
  }
}

A. 0 0 0 0 0
B. 1 1 1 1 1
C. 1 2 3 4 5
D. 0 1 2 3 4

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20. What is the output of this program?

#include <stdio.h>
int test() 
{
  static int n = 10;
  return n--;
}
 
int main()
{
  for(test(); test(); test())
    printf("%d ", test());
  return 0;
}

A. 7 4 1
B. 8 5 2
C. Infinite loop
D. Compilation Error

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21. What is the output of this program?

int main()
{
  void test(), temp();
  temp();
}
void test()
{
  printf("2 ");
}
void temp()
{
  printf("1 ");
  test();
}

A. 1 0
B. 0 1
C. Compile time error as foo is local to main
D. Compile time error due to declaration of functions inside main

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22. What is the output of this program?

#include <stdio.h>
void main()
    {
        test();
        void test()
        {
            printf("1");
        }
    }

A. 1
B. Compilation Error
C. Run Time Error
D. None of the above

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23. What is the output of this program?

#include <stdio.h>
void test(int * , int *);
void main()
{
  int a = 5 , b = 6;
  test(&a,&b);
  printf("%d %d",a,b);
}
void test(int *p, int *q)
{
  *p = *p * *q;
  *q = *p / *q;
  *p = *p / *q;
}

A. 30 5
B. 6 5
C. 5 6
D. None of the above

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24. What is the output of this program?

#include <stdio.h>
void test(char**);

int main()
{
    char *argv[] = {"a", "b", "c", "d"};
    test(argv);
    return 0;
}
void test(char **p)
{
    char *m;
    m = (p+= sizeof(int))[-2];
    printf("%s", m);
}

A. a
B. b
C. c
D. d

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25. What is the output of this program?

#include <stdio.h>
int main()
{
 char *ptr = "Hello";
 printf("%c", *&*&*ptr);
 return 0;
}

A. H
B. Compilation Error
C. Run Time Error
D. Garbage Value

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26. What is the output of this program?

#include <stdio.h>
void test(int *a, int *b) 
{ 
  a = b; 
  *a = 15; 
} 
int x = 10, y = 20; 
int main() 
{ 
  test(&x, &y); 
  printf("%d %d", x, y);
  return 0; 
}

A. 15 15
B. 10 15
C. 10 20
D. 15 20

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27. What does the following statment mean?

    int (*ptr)[5];

A. ptr is an array of 5 integers
B. ptr is a pointer to an array of 5 integers
C. ptr is array of pointers to 5 integers
D. ptr is an pointer to array

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28. What is the output of this program?

  
#include <stdio.h> 
int main()
{
int a = 5;
void *ptr = &a ;
printf("%f", *(float*)ptr);
return 0;
}

A. 5
B. 5
C. 0
D. 0

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29. What is the output of the given code ?

#include <stdio.h>
void main()
{
int a = 0 ;     
int *const ptr = &a ; 
printf("%p ", ptr);
ptr++;
printf("%p ", ptr);
}

A. 0 1
B. compilation Error
C. Run Time Error
D. None of the above

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30. What is the output of this program?

#include <stdio.h>
void main()
{
int a = 5 ;
int *b = &a ;
int **c = &b ;
printf("%d %d %d", a, *b, **c);
}

A. 5 garbage value garbage value
B. 5 5 garbage value
C. 5 5 5
D. Error

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31. What is the output of this program?

#include <stdio.h>
void main()
{
int arr[3] = {1, 2, 3};
int *ptr = arr;
int **temp = &ptr ; 
printf("%p %p", *temp, arr);
}

A. Same Address
B. Different Address
C. 1 2
D. 2 3

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32. The pointer ptr points to which string?

char *ptr;
char myString[]="letsfind";
ptr=myString
ptr+=5;

A. find
B. ind
C. letsf
D. f

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33. What will be the output ?

void main()
{
char far *farther, *farthest;
printf("%d %d", sizeof(farther), sizeof(farthest));
}

A. 4 2
B. 2 2
C. 4 4
D. 2 4

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34. What is the output of this program?

#include <stdio.h>
void test(int * , int *);
void main()
{
  int a = 5 , b = 6;
  test(&a,&b);
  printf("%d %d",a,b);
}
void test(int *p, int *q)
{
  *p = *p * *q;
  *q = *p + *q;
  *p = *p - *q;
}

A. -6 36
B. 6 36
C. 36 6
D. -42

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35. Will the program compile?

#include<stdio.h>
int main()
{
    char str[5] = "Letsfind";
    return 0;
}

A. TRUE
B. FALSE
C. May Be
D. Can't Say

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36. Are the three declarations char **apple, char *apple[], and char apple[][] same?

A. TRUE
B. FALSE
C. May Be
D. Can't Say

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37. Is the NULL pointer same as an uninitialised pointer?

A. Yes
B. No
C. May Be
D. Can't Say

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38. Which of the following statements correct about k used in the below statement?

char ****k;

A. k is a pointer to a pointer to a pointer to a char
B. k is a pointer to a pointer to a pointer to a pointer to a char
C. k is a pointer to a char pointer
D. k is a pointer to a pointer to a char

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39. Is there any difference between the following two statements?

char *p=0;
char *t=NULL;

A. Yes
B. No
C. May Be
D. Can't Say

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40. Is this a correct way for NULL pointer assignment?

int i=0;
char *q=(char*)i;

A. Yes
B. No
C. May Be
D. Can't Say

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