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c++ Fahrenheit or Celsius converter

Hi Just wondering why this is not working, as of right now it prints out just the Fahrenheit one no matter if i select c or f. plz help

#include <iostream>
using namespace std;

int main()
{

    char unit;
    float degrees = 0.0;
    float Farenheit, Celsius;

   cout << "Enter the temperature unit you are currently in (f or c): ";
   cin >> unit;
   cout << "Enter the temperature in degrees: ";
   cin >> degrees;

   if ( unit == 'c' || 'C')
   {
      Farenheit = (degrees - 32) / 9 * 5.0;
      cout << "The degrees in Farenheit are: " << Farenheit << endl;
   }

   else if ( unit == 'f' || 'F')
   {
      Celsius = (degrees - 32) * 5.0/9;
      cout << "The degrees in Celsius is: " << Celsius << endl;
   }

   return 0;
   }
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This might work better:

if ( unit == 'c' || unit == 'C')

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