#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
    int n = 141;
    //1) 分别以十六进制、十进制、八进制先后输出 n
    cout << "1)" << hex << n << " " << dec << n << " " << oct << n << endl;
    double x = 1234567.89, y = 12.34567;
    //2)保留5位有效数字
    cout << "2)" << setprecision(5) << x << " " << y << " " << endl;
    //3)保留小数点后面5位
    cout << "3)" << fixed << setprecision(5) << x << " " << y << endl;
    //4)科学计数法输出，且保留小数点后面5位
    cout << "4)" << scientific << setprecision(5) << x << " " << y << endl;
    //5)非负数显示正号，输出宽度为12字符，宽度不足则用 * 填补
    cout << "5)" << showpos << fixed << setw(12) << setfill(‘*‘) << 12.1 << endl;
    //6)非负数不显示正号，输出宽度为12字符，宽度不足则右边用填充字符填充
    cout << "6)" << noshowpos << setw(12) << left << 12.1 << endl;
    //7)输出宽度为 12 字符，宽度不足则左边用填充字符填充
    cout << "7)" << setw(12) << right << 12.1 << endl;
    //8)宽度不足时，负号和数值分列左右，中间用填充字符填充
    cout << "8)" << setw(12) << internal << -12.1 << endl;
    cout << "9)" << 12.1 << endl;

    cin.get();
    return 0;
}

#include <iostream>
#include <bitset> //输出二进制的头文件
using namespace std;

int main()
{
    int a = 10;
    cout << "十进制： " << a << endl;
    cout << "二进制： " << bitset<sizeof(a) * 8>(a) << endl;

    cin.get();
    return 0;
}

#include <iostream>
#include <iomanip>
#include <string>
using namespace std;
int main()
{
    string s1, s2;
    cin >> setw(4) >> s1 >> setw(3) >> s2;
    cout << s1 << "," << s2 << endl;

    cin.get();
    return 0;
}