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# Function Pointer example program in C programming.

A function pointer is a pointer variable that can store address of a function and then using the function pointer we can call initialized function in our program.

## Function Pointer Example using C program

#### Declaration of function pointer

`return_type (*fun_pointer_name)(argument_type_list);`

#### Initialization of function pointer

`fun_pointer_name= &function_name;`
`fun_pointer_name= function_name;`

#### Calling of function pointer

`*(fun_pointer_name)(actual_argument_list);`

#### Declaration with Initialization

`return_type (*fun_pointer_name)(argument_type_list)= &function_name;`
Consider the example
```/*function pointer example in c.*/

#include <stdio.h>

//function: sum, will return sum of two
//integer numbers
int addTwoNumbers(int x,int y)
{
return x+y;
}

int main()
{
int a,b,sum;

//function pointer declaration
int (*ptr_sum)(int,int);
//function initialisation
ptr_sum=&addTwoNumbers;

a=10;
b=20;

//function calling
sum=(*ptr_sum)(a,b);

printf("Sum is: %d\n",sum);

return 0;
}

```
```
Sum is: 30

```

#### int addTwoNumbers(int x,int y);

This function will take two integer arguments and returns addition of those numbers.

#### int (*ptr_sum)(int,int);

This is the declaration of the function pointer for addTwoNumbers function.

#### ptr_sum=&addTwoNumbers;

This statement is initializing the function pointer with address of function addTwoNumbers.

#### (*ptr_sum)(a,b);

This statement is the calling the function ptr_sum and ptr_sum will point to the addTwoNumbers.

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