School Stuff 05

//How to while loop

// Identify visible light color based on the wavelength
// Color Approximate wavelength range (microns)
// Violet 0.400 - 0.424
// Blue 0.424 - 0.491
// Green 0.491 - 0.575
// Yellow  0.575 - 0.585
// Orange 0.585 - 0.647
// Red    0.647 - 0.700

#include <iostream>
using namespace std;
 int main()
 {
     double wavelength; //wavelength in microns
     cout << "This program identify visible light color\n" << "based on the wavelengths\n"; // Get the first wavelength
     cout << "Enter a wavelength (microns) ==> ";
     cin >> wavelength;

    while(wavelength !=0)
    {

    if (wavelength <0)
        cout << "Negative wavelength is invalid \n\n";
    else if (wavelength < 0.4)
        cout << wavelength << " microns wavelength is outside visual range \n\n";
    else if (0.4 <= wavelength && wavelength <= 0.424)
        cout << wavelength << " microns wavelength ==> Violet\n\n";
    else if (0.424 < wavelength && wavelength <= 0.491)
        cout << wavelength << " microns wavelength ==> Blue\n\n";
    else if (0.491 < wavelength && wavelength <= 0.575)
        cout << wavelength << " microns wavelength ==> Green\n\n";
    else if (0.575 < wavelength && wavelength <= 0.585)
        cout << wavelength << " microns wavelength ==> Yellow\n\n";
    else if (0.585 < wavelength && wavelength <= 0.647)
        cout << wavelength << " microns wavelength ==> Orange\n\n";
    else if (0.647 < wavelength && wavelength <= 0.700)
        cout << wavelength << " microns wavelength ==> Red\n\n";
    else
    cout << wavelength << " microns wavelength is outside visual range\n\n";

        cout<<"Enter a wavelength (microns) or 0 to quit"<<endl<<"Enter a wavelength (microns) ==> ";
        cin>>wavelength;

    }

return 0;
}