C Programming Questions and Answers – Address Arithmetic

C Programming Questions and Answers – Address Arithmetic

1.What is the output of this C code?

#include <stdio.h>

int main()

{

double *ptr = (double *)100;

ptr = ptr + 2;

printf(“%u”, ptr);

}

a) 102

b) 104

c) 108

d) 116

2.Comment on the output of this C code?

#include <stdio.h>

int main()

{

int *p = (int *)2;

int *q = (int *)3;

printf(“%d”, p + q);

}

a) 2

b) 3

c) 5

d) Compile time error

3.Which of the following operand can be applied to pointers p and q?(Assuming initialization as int *a = (int *)2; int *b = (int *)3;)

a) a + b

b) a – b

c) a * b

d) a / b

4.What is the size of *ptr in a 32-bit machine, (assuming initialization as int *ptr = 10;)?

a) 1

b) 2

c) 4

d) 8

5.Which of following logical operation can be applied to pointers?

(Assuming initialization int *a = 2; int *b = 3;)

a) a | b

b) a ^ b

c) a & b

d) None of the mentioned

6.What is the output of this C code?

#include <stdio.h>

void main()

{

char *s = “hello”;

char *p = s;

printf(“%c\t%c”, *(p + 1), s[1]);

}

a) h e

b) e l

c) h h

d) e e

7.What is the output of this C code?

#include <stdio.h>

void main()

{

char *s = “hello”;

char *p = s;

printf(“%c\t%c”, *p, s[1]);

}

a) e h

b) Compile time error

c) h h

d) h e

8.What is the output of this C code?

#include <stdio.h>

void main()

{

char *s = “hello”;

char *n = “cjn”;

char *p = s + n;

printf(“%c\t%c”, *p, s[1]);

}

a) h e

b) Compile time error

c) c o

d) h n

9.What is the output of this C code?

#include <stdio.h>

void main()

{

char *s = “hello”;

char *p = s * 3;

printf(“%c\t%c”, *p, s[1]);

}

a) h e

b) l e

c) Compile time error

d) l h

10.What is the output of this C code?

#include <stdio.h>

void main()

{

char *s= “hello”;

char *p = s + 2;

printf(“%c\t%c”, *p, s[1]);

}

a) l e

b) h e

c) l l

d) h l

11.What is the output of this C code?

#include <stdio.h>

int main()

{

void *p;

int a[4] = {1, 2, 3, 8};

p = &a[3];

int *ptr = &a[2];

int n = p – ptr;

printf(“%d\n”, n);

}

a) 1

b) Compile time error

c) Segmentation fault

d) 4

12.What is the output of this C code?

#include <stdio.h>

int main()

{

void *p;

int a[4] = {1, 2, 3, 4};

p = &a[3];

int *ptr = &a[2];

int n = (int*)p – ptr;

printf(“%d\n”, n);

}

a) 1

b) Compile time error

c) Segmentation fault

d) 4

13.What is the output of this C code?

#include <stdio.h>

int main()

{

int a[4] = {1, 2, 3, 4};

int b[4] = {1, 2, 3, 4};

int n = &b[3] – &a[2];

printf(“%d\n”, n);

}

a) -3

b) 5

c) 4

d) Compile time error

14.What is the output of this C code?

#include <stdio.h>

int main()

{

int a[4] = {1, 2, 3, 4};

int *p = &a[1];

int *ptr = &a[2];

ptr = ptr * 1;

printf(“%d\n”, *ptr);

}

a) 2

b) 1

c) Compile time error

d) Undefined behaviour

15.What is the output of this C code?

#include <stdio.h>

int main()

{

int a[4] = {1, 2, 3, 4};

int *ptr  =  &a[2];

float n = 1;

ptr = ptr + n;

printf(“%d\n”, *ptr);

}

a) 4

b) 3

c) Compile time error

d) Undefined behaviour

16.What is the output of this C code?

#include <stdio.h>

int main()

{

int a[4] = {1, 2, 3, 4};

void *p = &a[1];

void *ptr = &a[2];

int n = 1;

n = ptr – p;

printf(“%d\n”, n);

}

a) 1

b) 4

c) Compile time error

d) Depends on the compiler