Computer Programming - MCQS

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Questions:
1.
#include <stdio.h>

int main()

{int x; x = 5;        

                if(x > 5)x -= 5;

                else if(x >= 0)x += 00;

                else if(x)x += 5;

                else x -= 5;

                printf("%d\n",x);

                return 0;

}

Select one:

A. None of the above
B. 10
C. -5
D.  5
E.  6

The correct answer is: 5

2.
What is the output of the following code?

#include "stdio.h"

extern int a=5;

main(){

            void fun();

            printf("\n a=%d",a);

            fun();

            return 0;

            }

void fun()

{

            int a;

            printf(" in fun a=%d",a);

}

Select one:

A. a=0 in fun a=5
B. Error
C. None
D. a=5 in fun a=0

The correct answer is: a=5 in fun a=0

3.
What is the output of following program?

#include <stdio.h>

void abc(int a, int b)

{

            printf("%d%d",++a,++b);

            }

int main()

{

            int a=10;

            abc(++a,a++);

            abc(a++,++a);

            printf("%d",a);

            return 0;

}

Select one:

A. None
B. Error
C. 13 11 14 14 14
D. 13 11 14 15 14 

The correct answer is: 13 11 14 15 14

4.
What should be the output:

void main()

{

    int a = 10/3;

    printf("%d",a);

}

Select one:

A. 0
B. 3.0
C. 3.33
D. 3

The correct answer is:3

5.
#include <stdio.h>

int main()

{

                int i;

                if (printf("0"))

                    i = 3;

                else

                    i = 5;

                printf("%d", i);

                return 0;

}

Select one:

A. Error
B. 3
C. 03
D. None

The correct answer is: 03

6.
#include <stdio.h>

int main()

{

    int i = 0;

    switch (i)

    {

        case '0': printf("Hello");

                break;

        case '1': printf("world");

                break;

 default: printf("Helloworld");

    }

    return 0;

}

Select one:

A. Hello
B. Helloworld
C. None of these
D. world

The correct answer is: Helloworld

7.
What will be output of following program?

#include <stdio.h>

void convention(int,int,int);

int main()

{

    int a=5;   

    convention(a,++a,a++);

    return 0;

}

void  convention(int p,int q,int r)

{

    printf("%d %d %d",p,q,r);

}

Select one:

A. Error
B. None
C. 7 5 5
D. 7 7 5

The correct answer is: 7 7 5

8.#include<stdio.h>

void  main()

{    int a=15;   printf("%x", a);    getchar();  

}

Select one:
A. 15.0
B. 12
C. None of the above
D. f
E. c

The correct answer is: f

9.
What is the correct way to round off x, a float, to an int value?

Select one:
A. y=(int)(x+0.5)
B. y=(int)x+0.5
C. y=int(x+0.5)
D.  y=(int)(int)x+0.5)

The correct answer is: y=(int)(x+0.5)

10.
#include<stdio.h>

int main()

{

      int  i=10;

      printf("i=%d", i);

      {

            int  i=20;

                printf("i=%d", i);

                i++;

                printf("i=%d", i);

 }

      printf("i=%d", i);

      return 0;

}

Select one:
A. 10,10,20,21
B. None
C. Error
D. 10,20,21,10

The correct answer is:  10,20,21,10

11.

Is it true that a function may have several declarations, but only one definition?

Select one:
A. True
B. False

The correct answer is: True

12.
#include <stdio.h>

void  main()

{    printf("\\a, \\t ,\\n");  

}

Select one:

A.  \\a,\\t,\\n
B.  \a ,\t,\n
C. Compiler error
D.  \a \t \n
E.  \a \\t  \n

The correct answer is: \a ,\t,\n

13.
What is the output of following program?

#include <stdio.h>

#define sqr(i) i*i

main()

{  

printf("%d %d", sqr(3), sqr(3+1));

}

Select one:
A. Error: macro cannot be defined in lower case
B. 9 7
C. None of the above
D. 9 16

The correct answer is: 9 7

14.
Find the output

main()

{

     int x = 10;

            {

                int x = 0;

                printf("%d",x);

            }

}

Select one:
A. 10
B. Compilation Error
C. 0
D. Undefined

The correct answer is: 0

15.
#include<stdio.h>

int main() {

int a=11,b=5;

if(a=5) b++;

printf("%d %d", ++a, b++);

return 0;

}

Select one:
A. 12 7
B. 6 7
C. 5 6
D. 11 6
E. 6 6

The correct answer is: 6 6

16.
#include<stdio.h>

int main()

{

int a = -2;

if(a)

{

printf("Hello");

}

else{

printf("Hai");

}

return 0;

}

Select one:
A. Error
B. Hello
C. Hai
D. None of these

The correct answer is: Hello

17.
#include <stdio.h>

int main()

{

    int i = 3;

    switch (i)

    {

        case 0+1: printf("Welcome");

                break;

        case 1+2: printf("Hello");

                break;

 default: printf("Hai");

    }

    return 0;

}

Select one:
A. Welcome
B. Error
C. Hello
D. Hai

The correct answer is: Hello

18.
What is the output of following program?

#include <stdio.h>

 int main()

{

            int a=1;

            void xyz(int , int);

            xyz(++a,a++);

            xyz(a++,++a);

            printf("%d",a);

            return 0;

            }

   void xyz(int x, int y)

{

    printf("%d%d",x,y);

   }

Select one:
A. 3 1 1 4 5
B. 3 1 4 4 5
C. Error
D. None

The correct answer is: None

19.
What will be output of following program?

 #include <stdio.h>

main() {

  int i=1;

  printf("%d%d%d",i,++i,i++);

 }

Select one:
A. 3 3 1
B. 2 2 1
C. 1 2 2
D. 1 3 3

The correct answer is: 3 3 1