wap to find factorial value of a number using function.

in turboc++
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//program to get factorial value of a number using function.use no arguments and return some value
#include<stdio.h>                      //header file
#include<conio.h>
int factorial();                          // function prototype/declaration with return type int.
int main()                              //main function
{
printf("factorial value=%d",factorial()); // function calling with value.
return 0;                                       //returns 0 value
}
int factorial()                              // function body line ; also called function definition
{
int factorial_value=1,i;                             //initialization to value 1
 int n;                                       // variable declaration
 printf("enter a number\n");
 scanf("%d",&n);                            //input
for(i=1;i<=n;i++)                     //loop running from 1 to 100 with increment 1 each time
{
    factorial_value=factorial_value*i;                //formulation for factorial
}
return factorial_value;      // returning output of function
}



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in codeblocks:
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//program to get factorial value of a number using function.use no arguments and return some value
#include<stdio.h>                      //header file
int factorial();                          // function prototype/declaration with return type int.
int main()                              //main function
{
printf("factorial value=%d",factorial()); // function calling with value.
getch();
return 0;                                       //returns 0 value
}
int factorial()                              // function body line ; also called function definition
{
int factorial_value=1,i;                             //initialization to value 1
 int n;                                       // variable declaration
 printf("enter a number\n");
 scanf("%d",&n);                            //input
for(i=1;i<=n;i++)                     //loop running from 1 to 100 with increment 1 each time
{
    factorial_value=factorial_value*i;                //formulation for factorial
}
return factorial_value;      // returning output of function
}