两个工具 输出中间结果，计时函数

 1 #include <stdio.h>
 2 #include <time.h>
 3 int main() {
 4     const int MOD = 1000000;
 5     int n, s = 0;
 6     //scanf("%d", &n);
 7     n =10000000;
 8     for (int i = 1; i <= n; i++) {
 9         int factorial = 1;
10         for (int j = 1; j <= i; j++)
11             factorial = (factorial*j%MOD);
12         s = (s + factorial) % MOD;
13     }
14     cout << s; 
15     printf("Time used=%.2f\n", (double)clock() / CLOCKS_PER_SEC);
16     
17     return 0;
18 }