Pointers to Functions - C Programming Questions and Answers

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

Pre-requisite for C Pointers to Functions MCQ set: Video Tutorial on C Pointers.

1. Which function is not called in the following C program?

```
    #include <stdio.h>
```
```
    void first()
```
```
    {
```
```
        printf("first");
```
```
    }
```
```
    void second()
```
```
    {
```
```
        first();
```
```
    }
```
```
    void third()
```
```
    {
```
```
        second();
```
```
    }
```
```
    void main()
```
```
    {
```
```
        void (*ptr)();
```
```
        ptr = third;
```
```
        ptr();
```
```
    }
```

a) Function first
b) Function second
c) Function third
d) None of the mentioned
View Answer

Answer: d
Explanation: None.

2. How to call a function without using the function name to send parameters?
a) typedefs
b) Function pointer
c) Both typedefs and Function pointer
d) None of the mentioned
View Answer

Answer: b
Explanation: None.

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3. Which of the following is a correct syntax to pass a Function Pointer as an argument?
a) void pass(int (*fptr)(int, float, char)){}
b) void pass(*fptr(int, float, char)){}
c) void pass(int (*fptr)){}
d) void pass(*fptr){}
View Answer

Answer: a
Explanation: None.

4. Which of the following is not possible in C?
a) Array of function pointer
b) Returning a function pointer
c) Comparison of function pointer
d) None of the mentioned
View Answer

Answer: d
Explanation: None.

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

```
    #include <stdio.h>
```
```
    void first()
```
```
    {
```
```
        printf("Hello World");
```
```
    }
```
```
    void main()
```
```
    {
```
```
        void *ptr() = first;
```
```
        ptr++
```
```
        ptr();
```
```
    }
```

a) Illegal application of ++ to void data type
b) pointer function initialized like a variable
c) Illegal application of ++ to void data type & pointer function initialized like a variable
d) None of the mentioned
View Answer

Answer: c
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int mul(int a, int b, int c)
```
```
    {
```
```
        return a * b * c;
```
```
    }
```
```
    void main()
```
```
    {
```

        int (*function_pointer)(int, int, int);

```
        function_pointer  =  mul;
```

        printf("The product of three numbers is:%d",

```
        function_pointer(2, 3, 4));
```
```
    }
```

a) The product of three numbers is:24
b) Run time error
c) Nothing
d) Varies
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int mul(int a, int b, int c)
```
```
    {
```
```
        return a * b * c;
```
```
    }
```
```
    void main()
```
```
    {
```

        int (function_pointer)(int, int, int);

```
        function_pointer = mul;
```

        printf("The product of three numbers is:%d",

```
        function_pointer(2, 3, 4));
```
```
    }
```

a) The product of three numbers is:24
b) Compile time error
c) Nothing
d) Varies
View Answer

Answer: b
Explanation: None.

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

```
    #include <stdio.h>
```
```
    void f(int (*x)(int));
```
```
    int myfoo(int);
```
```
    int (*fooptr)(int);
```
```
    int ((*foo(int)))(int);
```
```
    int main()
```
```
    {
```
```
        fooptr = foo(0);
```
```
        fooptr(10);
```
```
    }
```
```
    int ((*foo(int i)))(int)
```
```
    {
```
```
        return myfoo;
```
```
    }
```
```
    int myfoo(int i)
```
```
    {
```
```
        printf("%d\n", i + 1);
```
```
    }
```

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

Answer: b
Explanation: None.

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