【c++练习】1

1、字段宽度、填充和对齐

#include <iostream>
#include <iomanip>

int main()
{
    using namespace std;
    cout << '|' << setfill('*') << setw(6) <<  1234 << "|\n";
    cout << '|' << left << setw(6) <<  1234 << "|\n";
    cout << '|' << setw(6) <<  -1234 << "|\n";
    cout << '|' << right << setw(6) <<  -1234 << "|\n";
    return 0;
}

2、打印乘法表

#include <iostream>
#include <iomanip>

int main()
{
    using namespace std;
    int const LOW = 1;
    int const HIGH = 10;
    int const COL_WIDTH = 4;

    // 所有数字必须右对齐
    cout << right;

    // 首先打印表头
    cout << setw(COL_WIDTH) << '*' << '|';
    for (int i = LOW; i <= HIGH; i++)
    {
        cout << setw(COL_WIDTH) << i;
    }
    cout << '\n';

    // 打印横线
    cout << setfill('-') << setw(COL_WIDTH) << "" << '+'
        << setw((HIGH - LOW + 1) * COL_WIDTH) << "" << '\n';

    // 重设填充字符
    cout << setfill(' ');
    // 打印每一行
    for (int row = LOW; row <= HIGH; row++)
    {
        cout << setw(COL_WIDTH) << row << '|';
        // 打印列
        for (int col = LOW; col <= HIGH; col++)
        {
            cout << setw(COL_WIDTH) << row * col;
        }
        cout << '\n';
    }
    return 0;
}