C_测试代码运行时间

#include<stdio.h>
#include<stdlib.h>
#include<time.h>

//测试for循环时间 
void delay(unsigned int t)
{
        unsigned int i,j;
        for(i=0;i<t;i++)
            for(j=0;j<t;j++)
            ;
}

int main( )
{

    clock_t start, finish;
    double Text_time;
    start = clock();
    delay(1000);
    finish = clock();
    Text_time = (double)(finish-start) / CLOCKS_PER_SEC;
    printf("%lf seconds/n", Text_time);
    return 0;
}