C++ 指定输出宽度和填充

#include <iostream>
using namespace std;
int main(int argc, char *argv[])
{
    cout << 123 << endl;
    cout.width(10);
    cout << 123 << endl;
    cout << 123 << endl;
    cout.width(1);
    cout << 123 << endl;
    cout.width(10);
    cout.fill('*');
    cout << 123 << endl;
    cout.width(10);
    cout << 123 << endl;
    return 0;
}