C Programming Questions and Answers on Multidimensional Arrays for Freshers

1. What is the correct syntax to send a 3-dimensional array as a parameter?
    (Assuming declaration int a[5][4][3];)

a) func(a);
b) func(&a);
c) func(*a);
d) func(**a);

Answer: a

2. Applications of multidimensional array are?

a) Matrix-Multiplication
b) Minimum Spanning Tree
c) Finding connectivity between nodes
d) All of the mentioned

Answer: d

3. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         int ary[2][3];

5.         foo(ary);

6.     }

7.     void foo(int *ary[])

8.     {

9.         int i = 10, j = 2, k;

10.         ary[0] = &i;

11.         ary[1] = &j;

12.         *ary[0] = 2;

13.         for (k = 0;k < 2; k++)

14.         printf("%d\n", *ary[k]);

15.     }

a) 2 2
b) Compile time error
c) Undefined behaviour
d) 10 2

Answer: a

4. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         int ary[2][3];

5.         foo(ary);

6.     }

7.     void foo(int (*ary)[3])

8.     {

9.         int i = 10, j = 2, k;

10.         ary[0] = &i;

11.         ary[1] = &j;

12.         for (k = 0;k < 2; k++)

13.         printf("%d\n", *ary[k]);

14.     }

a) Compile time error
b) 10 2
c) Undefined behaviour
d) segmentation fault/code crash

Answer: a

5. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         foo(ary);

5.     }

6.     void foo(int **ary)

7.     {

8.         int i = 10, k = 10, j = 2;

9.         int *ary[2];

10.         ary[0] = &i;

11.         ary[1] = &j;

12.         printf("%d\n", ary[0][1]);

13.     }

a) 10
b) 2
c) Compile time error
d) Undefined behaviour

Answer: d

6. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         int ary[2][3][4], j = 20;

5.         ary[0][0] = &j;

6.         printf("%d\n", *ary[0][0]);

7.     }

a) Compile time error
b) 20
c) Address of j
d) Undefined behaviour

Answer: a

7. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         int ary[2][3];

5.         ary[][] = {{1, 2, 3}, {4, 5, 6}};

6.         printf("%d\n", ary[1][0]);

7.     }

a) Compile time error
b) 4
c) 1
d) 2

Answer: a

8. What is the output of this C code?

1.     #include 

2.     void main()

3.     {

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

5.         int i = 0, j = 0;

6.         for (i = 0; i < 2; i++)

7.         for (j = 0; j < 3; j++)

8.         printf("%d", a[i][j]);

9.     }

a) 1 2 3 4 5 0
b) 1 2 3 4 5 junk
c) 1 2 3 4 5 5
d) Run time error

Answer: a

9. What is the output of this C code?

1.     #include 

2.     void main()

3.     {

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

5.         int i = 0, j = 0;

6.         for (i = 0; i < 2; i++)

7.         for (j = 0; j < 3; j++)

8.         printf("%d", a[i][j]);

9.     }

a) 1 2 3 junk 4 5
b) Compile time error
c) 1 2 3 0 4 5
d) 1 2 3 3 4 5

Answer: b

10. What is the output of this C code?

1.     #include 

2.     void f(int a[][3])

3.     {

4.         a[0][1] = 3;

5.         int i = 0, j = 0;

6.         for (i = 0; i < 2; i++)

7.         for (j = 0; j < 3; j++)

8.         printf("%d", a[i][j]);

9.     }

10.     void main()

11.     {

12.         int a[2][3] = {0};

13.         f(a);

14.     }

a) 0 3 0 0 0 0
b) Junk 3 junk junk junk junk
c) Compile time error
d) All junk values

Answer: a

11. What is the output of this C code?

1.     #include 

2.     void f(int a[][])

3.     {

4.         a[0][1] = 3;

5.         int i = 0, j = 0;

6.         for (i = 0;i < 2; i++)

7.         for (j = 0;j < 3; j++)

8.         printf("%d", a[i][j]);

9.     }

10.     void main()

11.     {

12.         int a[2][3] = {0};

13.         f(a);

14.     }

a) 0 3 0 0 0 0
b) Junk 3 junk junk junk junk
c) Compile time error
d) All junk values

Answer: c

12. What is the output of this C code?

1.     #include 

2.     void f(int a[2][])

3.     {

4.         a[0][1] = 3;

5.         int i = 0, j = 0;

6.         for (i = 0;i < 2; i++)

7.         for (j = 0;j < 3; j++)

8.         printf("%d", a[i][j]);

9.     }

10.     void main()

11.     {

12.         int a[2][3] = {0};

13.         f(a);

14.     }

a) 0 3 0 0 0 0
b) Junk 3 junk junk junk junk
c) Compile time error
d) All junk values

Answer: c

13. Comment on the following statement:
    int (*a)[7];

a) An array “a” of pointers.
b) A pointer “a” to an array.
c) A ragged array.
d) None of the mentioned

Answer: b

14. Comment on the 2 arrays regarding P and Q:

1. int *a1[8];

2.     int *(a3[8]);

3.     P. Array of pointers

4.     Q. Pointer to an array

a) a1 is P, a2 is Q
b) a1 is P, a2 is P
c) a1 is Q, a2 is P
d) a1 is Q, a2 is Q

Answer: b

15. Which of the following is not possible statically in C?

a) Jagged Array
b) Rectangular Array
c) Cuboidal Array
d) Multidimensional Array

Answer: a