Factorial.cpp

#include <bits//stdc++.h>
using namespace std;

int a[10000];
int m, n, x, temp, sum, i, j;

int main()
{
    while(scanf("%d", &n)==1){
    a[0] = 1;
    m = 1;
    sum = 0;
    temp = 0;
    for(i=1; i<=n; i++) {
        for(j=0; j<m; j++) {
            x = a[j]*i+temp;  a[j] = x%10;  temp = x/10;
    }

    while(temp>0) {
            a[m] = temp%10;
            temp = temp/10;
            m++;
        }
    }

    a[m] = '\0';
    for(j=m-1; j>=0; j--){
        printf("%d", a[j]);
    }
    printf("\n");
    }
    return 0;
}