cin and cout

#include <iostream>
using namespace std;
main()
{ int a=1;//不赋值，会是一些乱码
  float b=2;
  double c=3;
  cout<<a<<'\n';// new line 要加上单引号
  cout<<b<<endl;
  cout<<"the sum of a+b is";// notice
  cout<<a+b; //can do some operation
  cout<<c;
  cout<<a<<b<<c;//可以连着写
  cin>>a>>b>>c;
}
//the different of\n and endl  is that endl refrese buffer

转载于:https://www.cnblogs.com/zhanghui0910/archive/2009/02/16/1391661.html