C++之hello world

#include "stdafx.h"
#include <iostream>
using namespace std;

int main()
{
cout << "hello world" <<endl;
cin.get();　　　　　　
return 0;
}

计算程序执行时间

#include <iostream>
#include <time.h>

clock_t start_time    = clock();

    for (int i = 0; i < 10000; i++)
    {
        printf("%s","hello world");
    }
    
    clock_t end_time    = clock();

    std::cout<<"excuting time is :"<<static_cast<double>(end_time - start_time)/CLOCKS_PER_SEC * 1000<<"ms"<<std::endl;