Program To Calculate Factorial Of Large Numbers

Program To Calculate Factorial Of Very Large Numbers :-
-------------------------------------------------------------------------------------------------------------------------------------------------------
#include"stdio.h"
#define MAX 10000
#include<conio.h>
void factorialof(int);
void multiply(int);
int length = 0;
int fact[MAX];

void main(){
int num;
int i;
clrscr();
printf("Enter any integer number : ");
scanf("%d",&num);

fact[0]=1;

factorialof(num);

printf("Factorial is : ");
for(i=length;i>=0;i--){
printf("%d",fact[i]);
}

getch();
}
void factorialof(int num){
int i;
for(i=2;i<=num;i++){
multiply(i);
}
}
void multiply(int num){
long i,r=0;
int arr[MAX];
for(i=0;i<=length;i++){
arr[i]=fact[i];
}

for(i=0;i<=length;i++){
fact[i] = (arr[i]*num + r)%10;
r = (arr[i]*num + r)/10;
//printf("%d ",r);
}
if(r!=0){
while(r!=0){
fact[i]=r%10;
r= r/10;
i++;
}
}
length = i-1;
}
 
This Program is Based On Concept Of Arbitrary Precision Arithmetic . 
check out http://en.wikipedia.org/wiki/Arbitrary-precision_arithmetic for more details .
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Location: Pandeypur, Uttar Pradesh, India

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