3-Dimensional Arrays in C Questions and Answers

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Multidimensional Arrays – 2”.

Pre-requisite for C Multidimensional Arrays MCQ set: Video Tutorial on 3-Dimensional Arrays.

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);
View Answer

Answer: a
Explanation: None.

2. What are the applications of a multidimensional array?
a) Matrix-Multiplication
b) Minimum Spanning Tree
c) Finding connectivity between nodes
d) All of the mentioned
View Answer

Answer: d
Explanation: None.

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3. What will be the output of the following C code?

```
    #include <stdio.h>
```
```
    void foo(int *ary[]);
```
```
    int main()
```
```
    {
```
```
        int ary[2][3];
```
```
        foo(ary);
```
```
    }
```
```
    void foo(int *ary[])
```
```
    {
```
```
        int i = 10, j = 2, k;
```
```
        ary[0] = &i;
```
```
        ary[1] = &j;
```
```
        *ary[0] = 2;
```
```
        for (k = 0;k < 2; k++)
```
```
        printf("%d\n", *ary[k]);
```
```
    }
```

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

Answer: a
Explanation: None.

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4. What will be the output of the following C code?

```
    #include <stdio.h>
```
```
    void foo(int (*ary)[3]);
```
```
    int main()
```
```
    {
```
```
        int ary[2][3];
```
```
        foo(ary);
```
```
    }
```
```
    void foo(int (*ary)[3])
```
```
    {
```
```
        int i = 10, j = 2, k;
```
```
        ary[0] = &i;
```
```
        ary[1] = &j;
```
```
        for (k = 0;k < 2; k++)
```
```
        printf("%d\n", *ary[k]);
```
```
    }
```

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

Answer: a
Explanation: None.

5. What will be the output of the following C code?

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        foo(ary);
```
```
    }
```
```
    void foo(int **ary)
```
```
    {
```
```
        int i = 10, k = 20, j = 30;
```
```
        int *ary[2];
```
```
        ary[0] = &i;
```
```
        ary[1] = &j;
```
```
        printf("%d\n", ary[0][1]);
```
```
    }
```

a) 10
b) 20
c) Compile time error
d) Undefined behaviour
View Answer

Answer: d
Explanation: None.

6. What will be the output of the following C code?

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int ary[2][3][4], j = 20;
```
```
        ary[0][0] = &j;
```
```
        printf("%d\n", *ary[0][0]);
```
```
    }
```

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

Answer: a
Explanation: None.

7. What will be the output of the following C code?

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int ary[2][3];
```

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

```
        printf("%d\n", ary[1][0]);
```
```
    }
```

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

Answer: a
Explanation: None.

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