C++で九九の表を作る

std::setw(3) 

  1,  2,  3,  4,  5,  6,  7,  8,  9,
  2,  4,  6,  8, 10, 12, 14, 16, 18,
  3,  6,  9, 12, 15, 18, 21, 24, 27,
  4,  8, 12, 16, 20, 24, 28, 32, 36,
  5, 10, 15, 20, 25, 30, 35, 40, 45,
  6, 12, 18, 24, 30, 36, 42, 48, 54,
  7, 14, 21, 28, 35, 42, 49, 56, 63,
  8, 16, 24, 32, 40, 48, 56, 64, 72,
  9, 18, 27, 36, 45, 54, 63, 72, 81,

#include <iostream>
#include <iomanip>

int main() {
    double a, b;

    for (char i = 1; i <= 9; i++) {
        for (char j = 1; j <= 9; j++) {
            std::cout << std::setw(3) << i * j << "," ;
        }
        std::cout << std::endl;
    }
    return 0;
}