Initialization of Pointer Arrays in C Questions and Answers

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

Pre-requisite for C Pointer Arrays Initialization MCQ set: Video Tutorial on C Pointers.

1. What will be the output of the following 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
View Answer

Answer: c
Explanation: None.

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

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```
    #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
View Answer

Answer: b
Explanation: None.

3. What will be the output of the following 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
View Answer

Answer: c
Explanation: None.

4. What will be the output of the following 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
View Answer

Answer: c
Explanation: None.

5. What will be the output of the following 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
View Answer

Answer: d
Explanation: None.

6. 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.”;
View Answer

Answer: a
Explanation: None.

7. 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
View Answer

Answer: a
Explanation: None.

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