控制输出精度，为什么只有y输出 ，而X不输出 ，求解 ！！

[weixin_36747231]

#include "stdafx.h"
#include<iostream>
#include<iomanip>
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
int x=123;
double y=3.1415;
cout<<"x=";
cout.width(10);
cout<<"x=";
cout<<"y=";
cout.width(10);
cout<<y<<endl;
cout.fill('*');
cout.precision(4);
cout.setf(ios::showpos);
cout<<"x=";
cout.width(10);
cout<<"x=";
cout<<"y=";
cout.width(10);
cout<<y<<endl;

return 0;
}
+++++++++++++++++++++++++

[ccrun.com]

输出X你需要这样：

cout << x << std::endl;