C Aptitude Questions And Answers - C PREPROCESSOR

---------------------------------- Test Your "C" Skill -------------------------------------

PRE PROCESSOR  

1. Identify the token pasting operator?

a) +

b) ++

c) #

d) ##

Output:- D

2.

#include<stdio.h>

#define MAX 15

int main(){

    int num;

    num = ++MAX;

    printf("%d",num);

    return 0;

}

a.15

b.16

c.compile error

d.run time error

Output:- compile error

3.

#define MAX (x, y) ((x) > (y) ? (x) : (y))

main()

{

int x=5, y = 5;

printf(“maximum is %d”, MAX( ++x, ++y));

}

a) Maximum is 7

b) Maximum is 5

c) Maximum is 6

d) None 

Output:- A

4.

#define square (a) (a * a)

printf(“%d”, square (4 + 5));

a) 81

b) 4

c) 29

d) None 

Output:- C

5.

#define SQR(x) (x * x)

 main()

 {

  int a,b=3;

  a=SQR(b+2);

  printf(“\n%d”,a);

 }

a. 25

b. 11

c. error

d. garbage value

Output:- B

6.

#define SQR(x)( (x) *( x))

 main()

 {

  int a,b=3;

  a=SQR(b+2);

  printf(“\n%d”,a);

 }

a. 25

b. 11

c. error

d. garbage value

Output:- a

7.

#define CUBE(x) (x * x * x)

 main()

{

 int a,b=3;

 a=CUBE(b++);

 printf(“\n %d %d”,a,b);

 }

Output:- 27  6

8.

#define SWAP(a,b,c) (int t; t=a, a=b, b=t;)

main()

{

 int x=10,y=20;

 SWAP(x,y,int);

 Printf(“%d %d”,x,y);

}

Output:- (int t; t=a, a=b, b=t;);

 This code won’t compile since the declaration of t can’t take place within parenthesis.

9.How should you modify SWAP macro such that it can swap two integers?

Output:- #define SWAP(a,b,c)  c t; t=a, a=b, b=t;

10.

#define MESS junk

void main(){   printf(“MESS”);}

Output:- MESS

11.

#define MAX(a,b) (a>b?a:b)

main()

{

   int x;

   x=MAX(3+2,2+7);

   printf(“%d”,x);

}

Output:-  9

12.

#define PRINT(int) printf(“%d”,int)

main()

{

 int x=2,y=3,z=4;

 PRINT(x);

 PRINT(y);

 PRINT(z);

}

Output: 2 3 4