Function prototype : Function Prototype « Function « C Tutorial

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C Tutorial » Function » Function Prototype

8. 3. 1. Function prototype


#include <stdio.h>



int change(int number);                /*Function prototype */



int main(void)

{

  int number = 10;                    

  int result = 0;                     



  result = change(number);

  printf("\nIn main, result = %d\tnumber = %d", result, number);

  return 0;

}



int change(int number)

{

  number = 2 * number;

  printf("\nIn function change, number = %d\n", number);

  return number;

}

In function change, number = 20
     
     In main, result = 20    number = 10

8. 3. Function Prototype
	8. 3. 1.	Function prototype
	8. 3. 2.	Function is defined after main: prototype the function
	8. 3. 3.	Function is defined above the function main: it is not necessary to prototype the function

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