Play with C

1. function g(int n)

{

If(n>0) return 1;

else return -1;

}

function f( int a, int b)

{

If(a>b) return g(b-a);

If(a<b) return g(a-b);

return 0;

}

If f(a,b) is called , what is returned ?

• a)Always -1

• b)1 if a>b, -1 if a<b, 0 otherwise

• c)-1 if a>b, 1 if a<b, 0 otherwise

• d)0 if a equals b, -1 otherwise

2. Assuming n > 2. What value does the following function compute for even n ?

int f(int n)

{

If( n equals 1) { return 1}

If(n equals 2) { return f(n-1) + n/2 }

return f(n-2) + n

}

• a)1 +2 + 3 + 4 + …. +n

• b)1 + (2+4+ 6+ 8+ …. +n)

• c)1 + n/2 + (4 +6 + 8 + …. + n)

• d)2 + 4 + 6 + 8 + ……. + n

3. What is the output of the following code?

int main()

{

int i = 0;

switch(i)

{

case 0 : i++;

case 1 : i+++2;

case 2 : ++i;

}

printf("%d",i++);

return 0;

}

• a) 2

• b) 3

• c) 4

• d) 5

4. What is the output of this program?

int main()

{

int a = 1, b = 0;

int c = a%2 ? a++ : a-- ? a=0 : ++b ? b = 2 : b++ ;

printf("%d", c);

return 0;

}

• a) 1

• b) 2

• c) 3

• d) 0

5. 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)

6. 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

7. What will be the output of the program?

#include <stdio.h>

int main(void)

{

char p;

char buf[10]={1,2,3,4,5,6,9,8};

p=(buf+1)[5];

printf("%d",p);

return 0;

}

• a. 5

• b. 6

• c. 9

• d. None of the above

8. 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 36

9. Which statment is true about the given code?

#include <stdio.h>

#include <stdlib.h>

int main()

{

int *a[5];

a = (int*) malloc(sizeof(int)*5);

free(a);

return 0;

}

• a. Error:unable to allocate memory

• b. Error: We cannot store address of allocated memory in a

• c. Error: unable to free memory

• d. No error

10. Which statment is true about the given code?

#include <stdio.h>

enum colors {lets,find,course};

int main()

{

printf("%d %d %d",course,lets,find);

return 0;

}

• a. 3 1 2

• b. 0 1 2

• c. 2 0 1

• d. 1 0 2