using codeblocks
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//program to find factorial value of a number using function.
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//program to find factorial value of a number using function.
#include<stdio.h> //header file
void factorial(); // function prototype/declaration with return type zero.
int main() //main function
{
factorial(); // function calling.
return 0; //returns 0 value
}
void factorial() // function body line ; also called function definition
{
int i,n,facto=1; // variable declaration with 1 initialization
printf("enter a number\n"); //message display to input a number
scanf("%d",&n); //gets input
for(i=1;i<=n;i++) //loop running from 1 to n with increment 1 each time
{
facto=facto*i; // multiplication of numbers repetitively
}
printf("factorial value=%d\n",facto); //display of output.
}
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using turboc++
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//program to find factorial value of a number using function.
#include<stdio.h> //header file
#include<conio.h>
void factorial(); // function prototype/declaration with return type zero.
void main() //main function
{
factorial(); // function calling.
getch(); //holds the value
}
void factorial() // function body line ; also called function definition
{
int i,n,facto=1; // variable declaration with 1 initialization
printf("enter a number\n"); //message display to input a number
scanf("%d",&n); //gets input
for(i=1;i<=n;i++) //loop running from 1 to n with increment 1 each time
{
facto=facto*i; // multiplication of numbers repetitively
}
printf("factorial value=%d\n",facto); //display of output.
}
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factorial value of a number 6= 6x5x4x3x2x1 or
1x2x3x4x5x6
