#include<iostream.h>
int main()
{
cout<<”My name is Jone\n”;
cout<<”the ID is”;
cout<<2;
cout<<endl;
}
2.参考程序：
#include <iostream.h>
#include <iomanip.h> //要用到格式控制符
void main()
{
double amount = 22.0/7;
cout <<setprecision(0) <<amount <<endl
<<setprecision(1) <<amount <<endl
<<setprecision(2) <<amount <<endl
<<setprecision(3) <<amount <<endl
<<setprecision(4) <<amount <<endl;
cout <<setiosflags(ios::fixed);
cout <<setprecision(8) <<amount <<endl;
cout <<setiosflags(ios::scientific) <<amount <<endl;
cout <<setprecision(6); //重新设立成原默认设立
