C++程序修改

//Fig.1.2:fig01_02.cpp
//A first program in C++
#include<iostream.h>

int main()
{
    cout<<"Welcome to c++!\n";
    return 0;   //indicate that program ended sucessfully
}

调试说“源文件未编译”

#include<iostream>
using namespace std;//输入输出引用命名空间

int main()
{
 cout<<"Welcome to c++!\n";
 return 0;   //indicate that program ended sucessfully
}

按Ctrl+F5运行

在#include<iostream.h>下面加上

#include <string>

using namespace std;