#include <stdio.h>
int main() {
    int i,j,a[2048],N=200;
    //初始化陣列內容
    memset(a,0,sizeof(a));
    a[0]=1;
    for (i=1 ; i<=N ; i++)  {  //i 從 1 ~ 200 代表 1x2x3...x200
        //從最低位數開始計算新的結果
        for (j=0 ; j < sizeof(a)/sizeof(a[0]) ; j++) {
            a[j] *= i;
            }
        //處理數字進位
        for (j=0 ; j < sizeof(a)/sizeof(a[0])-1 ; j++) {
            a[j+1] += a[j]/10;
            a[j] %= 10;
        }
    }
    //準備列印出結果
    for (i=sizeof(a)/sizeof(a[0])-1 ; i >=0 ; i--) {
        if (a[i] != 0) break;
    }
    //印出計算完成的結果
    for ( ; i>=0 ; i--) {
        printf("%d",a[i]);
 
    } 
    system("pause"); 
}
 

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