C Programming Questions and Answers on Initialization of Pointer Arrays for Freshers

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

Answer: a

2. Comment on the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         char *a = {"p", "r", "o", "g", "r", "a", "m"};

5.         printf("%s", a);

6.     }

a) Output will be program
b) Output will be p
c) No output
d) Compile-time error

Answer: b

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

Answer: d

4. What is the output of this C code?

1.     #include 

2.     void main()

3.     {

4.         char *a[10] = {"hi", "hello", "how"};

5.         int i = 0;

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

7.         printf("%s", *(a[i]));

8.     }

a) segmentation fault
b) hi hello how followed by 7 null values
c) 10 null values
d) depends on compiler

Answer: a

5. What is the output of this C code?

1.     #include 

2.     void main()

3.     {

4.         char *a[10] = {"hi", "hello", "how"};

5.         int i = 0, j = 0;

6.         a[0] = "hey";

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

8.         printf("%s\n", a[i]);

9.     }

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

Answer: c

6. What is the output of this C code?

1.     #include 

2.     void main()

3.     {

4.         char *a[10] = {"hi", "hello", "how"};

5.         printf("%d\n", sizeof(a));

6.     }

a) 10
b) 13
c) Run time error
d) 40

Answer: d

7. What is the output of this C code?

1.     #include 

2.     void main()

3.     {

4.         char *a[10] = {"hi", "hello", "how"};

5.         printf("%d\n", sizeof(a[1]));

6.     }

a) 6
b) 4
c) 5
d) 3

Answer: b

8. What is the output of this C code?

1.     #include 

2.     void main()

3.     {

4.         char *a[10] = {"hi", "hello", "how"};

5.         int i = 0;

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

7.         printf("%s", a[i]);

8.     }

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

Answer: d

9. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         char *p[1] = {"hello"};

5.         printf("%s", (p)[0]);

6.         return 0;

7.     }

a) Compile time error
b) Undefined behaviour
c) hello
d) None of the mentioned

Answer: c

10. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         char **p = {"hello", "hi", "bye"};

5.         printf("%s", (p)[0]);

6.         return 0;

7.     }

a) Compile time error
b) Undefined behaviour
c) hello
d) Address of hello

Answer: b

11. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         int i = 0, j = 1;

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

6.         printf("%d", (*a)[0]);

7.         return 0;

8.     }

a) Compile time error
b) Undefined behaviour
c) 0
d) Some garbage value

Answer: c

12. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         int i = 0, j = 1;

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

6.         printf("%d", *a[0]);

7.         return 0;

8.     }

a) Compile time error
b) Undefined behaviour
c) 0
d) Some garbage value

Answer: c

13. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         int i = 0, j = 1;

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

6.         printf("%d", (*a)[1]);

7.         return 0;

8.     }

a) Compile time error
b) Undefined behaviour
c) 1
d) Some garbage value

Answer: d

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) char *string = “Hello.”; and char string[] = “Hello.”;

Answer: a

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) none of the mentioned

Answer: a