记录程序运行时间的程序实例

1 #include <cstdio>
2 #include <ctime>
3 #include <cstdlib>
4 #include <sys/time.h>
5 #include <time.h>
6 struct node {
7     int   a[3];
8 };
9 node ans [16][3920][18000];
10 int main()
11 {
12     printf("start!\n");
13     int a;
14     srand(0);
15     struct timeval tv_start,tv_end;
16     gettimeofday(&tv_start,NULL);
17 //程序
27     gettimeofday(&tv_end,NULL);
28     printf("time: %lf\n",tv_end.tv_sec - tv_start.tv_sec+(tv_end.tv_usec - tv_start.tv_    usec)/1000000.0);
29     return 0;
30 }