What is the Use of Function Pointer in C ?

#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <string.h>

/********** Addition ***************/
int add(int a, int b)
{
int c = a + b;
return c;
}

/********** Substraction ***************/
int sub(int a, int b)
{
int c = a - b;
return c;
}

/********** Multiplication ***************/
int mul(int a, int b)
{
int c = a * b;
return c;
}

/********** Division ***************/
int division(int a, int b)
{
int c = a / b;
return c;
}

int main()
{
//function pointer with two int as an argument and retuns int value
int (*ptr)(int,int);

int sum; //to get the sum value using function pointer

int num1 = 2, num2 = 1;

printf("Number1 = %d\nNumber2 = %d\n",num1,num2);

int val1 = 50; int val2 = 20; //used with arrary of function pointer

ptr = add; //Assign the function address to function pointer

sum = (*ptr)(num1,num2); //Calling the function using function pointer

printf("Addition using function pointer = %d\n",sum);

ptr = sub; //Assign the function address to function pointer

sum = (*ptr)(num1,num2); //Calling the function using function pointer

printf("Substraction using function pointer = %d\n",sum);

//Array of 4 function pointers accepting two int arguments and returns int
int (*aptr[4])(int,int) = {add, sub, mul, division};

//Calling the appropriate function using array of function pointer
int fptrResult = (aptr[sum])(val1,val2);

printf("Result = %d",fptrResult);

getch();
return 0;
}

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