#include <iostream>

using namespace std;

int main()
{
const int SIZE=50;                      //定义大小。
    char name[SIZE];                       
    cout<<"please input you name!\n";       //提示
    cin>>name;                              //输入
    cout<<"hello world:"<<name<<endl;       //输出
    return 0;
}                       

#include <iostream>

using namespace std;

int main()
{
char buf[30];
    cout<<"please input:\n";           //提示
    cin.ignore(7);                     //前7个不要
    cin.getline(buf,12);               //在取12个
    cout<<buf<<endl;                   //输出
    return 0;
}

//输入 ：i love programming
//输出 : programming

#include <iostream>
//#include <fstream>

using namespace std;

/*
int main()
{
    std::cout<<"enter two numbers:"<<std::endl;
    int a , b;
    std::cin>>a>>b;
    std::cout<<"a:"<<a<<"b:"<<b<<std::endl;
}
*/

int main()
{
    cout<<"please enter two numbers:"<<endl;
int a,b;
    cin>>a>>b;
    cout<<"a:"<<a<<endl;
    cout<<"b:"<<b<<endl;
}
//输入两个数，然后输出！