大数阶乘

#include<iostream>
using namespace std;
int main()
{
    int n,i,j;
    int jw;
    int gw=1;
    int a=0;
    int jc[10005];
    jc[0] = 1;
    scanf("%d",&n);
    for(i=2;i<=n;i++){
        for(j=0;j<gw;j++){
            jc[j] *= i;
        }
        jw = 0;
        for(j=0;j<gw;j++){
            jc[j] =    jc[j]+jw;
            jw = 0;
            if(jc[j]>=10){
                jw += jc[j]/10;
                jc[j] = jc[j]%10;
            }        
        }
        while(jw!=0){  //这里不能用if,因为jw可能大于10 
            jc[gw++] = jw%10;
            jw = jw/10;
        }
    }
    for(i=gw-1;i>=0;i--){
        printf("%d",jc[i]);
    }
    return 0;
}