6.26

/*6.26 Celsius and Fahrenheit Temperatures
F = C * 9/5 + 32
C = (F - 32) * 5 / 9

Deitel & Deitel C++ How to Program, 10th ed(Indian subcontinent adaptation)
Visual Studio Community 2019
*/

#include <iostream>
#include <iomanip>
using namespace std;

int main() {

    /* Note: Console settings inside VS 2019 Community:
    *     Font: Lucida Console, size 20
    *     Layout: Win width 160 */

    // Celsius to Fahrenheit
    for (int i = 1; i <= 5; i++) cout << setw(14) << "Celsius" << setw(14) << "Fahrenheit";
    cout << endl;

    int row, col;
    for (row = 0; row <= 20; row++) {
        for (col = 0; col <= 4; col++) {
            if (row + col * 21 > 100) continue;
            cout << setw(14) << row+col*21 << setw(14) << (row + col * 21) * 9 / 5 + 32;
        }
        cout << endl;
    }

    cout << endl;

    // Fahrenheit to Celsius
    for (int i = 1; i <= 5; i++) cout << setw(14) << "Fahrenheit" << setw(14) << "Celsius";
    cout << endl;
    int fahr;
    for ( row = 0; row <= 36; row++ ) {
        for ( col = 0; col <= 4; col++ ) {
            if( ( row + col * 37 ) + 32 > 212 ) continue;
            fahr = ( row + col * 37 ) + 32;
            cout << setw(14) << fahr << setw(14) << ( fahr - 32 ) * 5 / 9; // don't wrap 5/9 in parens -- expr becomes 0!
        }
        cout << endl;
    }
    return 0;
}