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C Pointer to a function

                         

In this section, you will learn how to use 'Pointer'  function in C.

C provides a special feature of  pointer to a function. As you know  that every function defined in C language have a base address attached to it. This base address acts as an entering point into that function. This address can be stored in a pointer known as function pointer. The pointer to a function is the declaration of pointer that holds the base address of the function. The declaration of a pointer to a function is:

Syntax :
return_type (* pointer_name) ( variable1_type variable1_name  , variable2_type variable2_name , variable3_type variable3_name .................);  

You can see in the given example, we have create a function mul to find the product of three numbers. Then we have declared the function pointer for storing the base address of function mul in the following way:

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

Here is the code:

POINTERF.C

#include <stdio.h>
#include <conio.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(234));
  getch();
}

Output will be displayed as:

Download the code

                         

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