日志17
#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
cout << "系统默认是右对齐" << endl;
cout << setw(8) << 1.23 << endl;
cout << setw(8) << 1.23456 << endl;
cout << "设置left后，左对齐" << endl;
cout << left;
cout << setw(8) << 1.23 << endl;
cout << setw(8) << 1.23456 << endl;
return 0;
}
