C Programming Questions and Answers – Initialization of Pointer Arrays

C Programming Questions and Answers – Initialization of Pointer Arrays

1.To declare a 3 dimension array using pointers, which of the following is the correct syntax:

a) char *a[][];

b) char **a[];

c) char ***a;

d) All of the mentioned

2.Comment on the output of this C code?

#include <stdio.h>

int main()

{

char *a = {“p”, “r”, “o”, “g”, “r”, “a”, “m”};

printf(“%s”, a);

}

a) Output will be program

b) Output will be p

c) No output

d) Compile-time error

3.An array of strings can be initialized by:

a) char *a[] = {“Hello”, “World”};

b) char *a[] = {“Hello”, “Worlds”};

c) char *b = “Hello”;

char *c = “World”;

char *a[] = {b, c};

d) All of the mentioned.

4.What is the output of this C code?

#include <stdio.h>

void main()

{

char *a[10] = {“hi”, “hello”, “how”};

int i = 0;

for (i = 0;i < 10; i++)

printf(“%s”, *(a[i]));

}

a) Segmentation fault

b) hi hello how followed by 7 null values

c) 10 null values

d) depends on compiler

5.What is the output of this C code?

#include <stdio.h>

void main()

{

char *a[10] = {“hi”, “hello”, “how”};

int i = 0, j = 0;

a[0] = “hey”;

for (i = 0;i < 10; i++)

printf(“%s\n”, a[i]);

}

a) hi hello how Segmentation fault

b) hi hello how followed by 7 null values

c) hey hello how Segmentation fault

d) Depends on compiler

6.What is the output of this C code?

#include <stdio.h>

void main()

{

char *a[10] = {“hi”, “hello”, “how”};

printf(“%d\n”, sizeof(a));

}

a) 10

b) 13

c) Run time error

d) 40

7.What is the output of this C code?

#include <stdio.h>

void main()

{

char *a[10] = {“hi”, “hello”, “how”};

printf(“%d\n”, sizeof(a[1]));

}

a) 6

b) 4

c) 5

d) 3

8.What is the output of this C code?

#include <stdio.h>

void main()

{

char *a[10] = {“hi”, “hello”, “how”};

int i = 0;

for (i = 0;i < 10; i++)

printf(“%s”, a[i]);

}

a) hi hello how Segmentation fault

b) hi hello how null

c) hey hello how Segmentation fault

d) hi hello how followed by 7 nulls

9.What is the output of this C code?

#include <stdio.h>

int main()

{

char *p[1] = {“hello”};

printf(“%s”, (p)[0]);

return 0;

}

a) Compile time error

b) Undefined behaviour

c) hello

d) None of the mentioned

10.What is the output of this C code?

#include <stdio.h>

int main()

{

char **p = {“hello”, “hi”, “bye”};

printf(“%s”, (p)[0]);

return 0;

}

a) Compile time error

b) Undefined behaviour

c) hello

d) Address of hello

11.What is the output of this C code?

#include <stdio.h>

int main()

{

int i = 0, j = 1;

int *a[] = {&i, &j};

printf(“%d”, (*a)[0]);

return 0;

}

a) Compile time error

b) Undefined behaviour

c) 0

d) Some garbage value

12.What is the output of this C code?

#include <stdio.h>

int main()

{

int i = 0, j = 1;

int *a[] = {&i, &j};

printf(“%d”, *a[0]);

return 0;

}

a) Compile time error

b) Undefined behaviour

c) 0

d) Some garbage value

13.What is the output of this C code?

#include <stdio.h>

int main()

{

int i = 0, j = 1;

int *a[] = {&i, &j};

printf(“%d”, (*a)[1]);

return 0;

}

a) Compile time error

b) Undefined behaviour

c) 1

d) Some garbage value

14.Which of the following are generated from char pointer?

a) char *string = “Hello.”;

b) char *string;

scanf(“%s”, string);

c) char string[] = “Hello.”;

d) Both (a) and (c).

15.Which of the following declaration are illegal?

a) int a[][] = {{1, 2, 3}, {2, 3, 4, 5}};

b) int *a[] = {{1, 2, 3}, {2, 3, 4, 5}};

c) int a[4][4] = {{1, 2, 3}, {2, 3, 4, 5}};

d) Both (a) and (b).