C++11 formatted output to generate multiplication formula table

C++ formatted output to generate multiplication formula table

The main contents of C++ formatted output are: field width, character padding, and character alignment.

• Field width: realized by the setw function, which can be set before, during, and after the character.
• Character stuffing: a setfill implemented function, setfill function is followed setw behind populate the gap (space by default).
• Character alignment: specified by std::ios_base::left , std::ios_base::adjustfield , std::ios_base::right, etc.
  The following three operations will generate a multiplication formula table:

#include <iostream>
#include <iomanip>

using namespace std;

int main(int argc, char** argv)
{
    int const low{1};
    int const high{9};
    int const colWidth{4};

    // 所有数据右对齐
    cout << right;
    // 绘制表头
    cout << setw(colWidth) << "*" << "|";
    for(int i{low};i <= high;i = i + 1){
        cout << setw(colWidth) << i;
    }
    cout << endl;
    cout << setfill('-') << setw(colWidth) << "" <<'+' 
        << setw((high-low+1) * colWidth) << "" << endl;

    // 重置cout
    cout << setfill(' ');

    // 绘制表格数据
    for(int row{low};row <= high;row = row + 1){
        cout << setw(colWidth) << row << "|";
        for(int col{low};col <= high;col = col + 1){
            cout << setw(colWidth) << row * col;
        }
        cout << endl;
    }

    return 0;
}

The output is as follows: