Multiple Choice Questions in C - Pointers and Function Arguments

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Pointers and Function Arguments – 1”.

Pre-requisite for C Pointers and Function Arguments MCQ set: Video Tutorial on C Pointers.

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

```
    #include <stdio.h>
```
```
    void foo(int*);
```
```
    int main()
```
```
    {
```
```
        int i = 10;
```
```
        foo((&i)++);
```
```
    }
```
```
    void foo(int *p)
```
```
    {
```
```
        printf("%d\n", *p);
```
```
    }
```

a) 10
b) Some garbage value
c) Compile time error
d) Segmentation fault/code crash
View Answer

Answer: c
Explanation: None.

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

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```
    #include <stdio.h>
```
```
    void foo(int*);
```
```
    int main()
```
```
    {
```
```
        int i = 10, *p = &i;
```
```
        foo(p++);
```
```
    }
```
```
    void foo(int *p)
```
```
    {
```
```
        printf("%d\n", *p);
```
```
    }
```

a) 10
b) Some garbage value
c) Compile time error
d) Segmentation fault
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    void foo(float *);
```
```
    int main()
```
```
    {
```
```
        int i = 10, *p = &i;
```
```
        foo(&i);
```
```
    }
```
```
    void foo(float *p)
```
```
    {
```
```
        printf("%f\n", *p);
```
```
    }
```

a) 10.000000
b) 0.000000
c) Compile time error
d) Undefined behaviour
View Answer

Answer: b
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int i = 97, *p = &i;
```
```
        foo(&i);
```
```
        printf("%d ", *p);
```
```
    }
```
```
    void foo(int *p)
```
```
    {
```
```
        int j = 2;
```
```
        p = &j;
```
```
        printf("%d ", *p);
```
```
    }
```

a) 2 97
b) 2 2
c) Compile time error
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()
```
```
    {
```
```
        int i = 97, *p = &i;
```
```
        foo(&p);
```
```
        printf("%d ", *p);
```
```
        return 0;
```
```
    }
```
```
    void foo(int **p)
```
```
    {
```
```
        int j = 2;
```
```
        *p = &j;
```
```
        printf("%d ", **p);
```
```
    }
```

a) 2 2
b) 2 97
c) Undefined behaviour
d) Segmentation fault/code crash
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int i = 11;
```
```
        int *p = &i;
```
```
        foo(&p);
```
```
        printf("%d ", *p);
```
```
    }
```
```
    void foo(int *const *p)
```
```
    {
```
```
        int j = 10;
```
```
        *p = &j;
```
```
        printf("%d ", **p);
```
```
    }
```

a) Compile time error
b) 10 10
c) Undefined behaviour
d) 10 11
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int i = 10;
```
```
        int *p = &i;
```
```
        foo(&p);
```
```
        printf("%d ", *p);
```
```
        printf("%d ", *p);
```
```
    }
```
```
    void foo(int **const p)
```
```
    {
```
```
        int j = 11;
```
```
        *p = &j;
```
```
        printf("%d ", **p);
```
```
    }
```

a) 11 11 11
b) 11 11 Undefined-value
c) Compile time error
d) Segmentation fault/code-crash
View Answer

Answer: b
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int i = 10;
```
```
        int *const p = &i;
```
```
        foo(&p);
```
```
        printf("%d\n", *p);
```
```
    }
```
```
    void foo(int **p)
```
```
    {
```
```
        int j = 11;
```
```
        *p = &j;
```
```
        printf("%d\n", **p);
```
```
    }
```

a) 11 11
b) Undefined behaviour
c) Compile time error
d) Segmentation fault/code-crash
View Answer

Answer: a
Explanation: None.

9. Which of the following is the correct syntax to send an array as a parameter to function?
a) func(&array);
b) func(#array);
c) func(*array);
d) func(array[size]);
View Answer

Answer: a
Explanation: None.

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