TemperatureConvertion.cpp

#include <bits/stdc++.h>
using namespace std;

int main(){
  cout << "=========================" << endl;
  cout << "=   CONVERTER PROGRAM   =" << endl;
  cout << "=     HACKTOBERFEST     =" << endl;
  cout << "=          2022         =" << endl;
  cout << "=========================" << endl;
  cout << "Temperature code : (C) Celcius, (R) Reaumur, (F) Fahrenheit, (K) Kelvin" << endl;
  cout << "# NOTE # Make sure you input an upper case character # NOTE #" << endl;
  
  char tempcode1, tempcode2;
  cout << "Input temperature code 1 : ";
  cin >> tempcode1;

  if(!(tempcode1 == 'C' or tempcode1 == 'R' or tempcode1 == 'F' or tempcode1 == 'K')){
    cout << "Invalid temperature code 1";
    return 0;
  }
  
  cout << "Input temperature code 2 : ";
  cin >> tempcode2;
  if(!(tempcode2 == 'C' or tempcode2 == 'R' or tempcode2 == 'F' or tempcode2 == 'K')){
    cout << "Invalid temperature code 2";
    return 0;
  }
  
  double temp, ans;
  cout << "Input temperature : ";
  cin >> temp;
  
  if(tempcode1 == 'C'){
    
    if(tempcode2 == 'C'){
      cout << "Imagine converting Celcius to Celcius" << endl;
    } else if(tempcode2 == 'R'){
      ans = 4.0 / 5.0 * temp;
    } else if(tempcode2 == 'F'){
      ans = 9.0 / 5.0 * temp + 32;
    } else if(tempcode2 == 'K'){
      ans = 273.15 + temp;
    }
      
  } else if(tempcode1 == 'R'){
    
    if(tempcode2 == 'C'){
      ans = 5.0 / 4.0 * temp;
    } else if(tempcode2 == 'R'){
      cout << "Imagine converting Reaumur to Reaumur" << endl;
    } else if(tempcode2 == 'F'){
      ans = 9.0 / 4.0 * temp + 32;
    } else if(tempcode2 == 'K'){
      ans = 5.0 / 4.0 * temp + 273.15;
    }
      
  } else if(tempcode1 == 'F'){
    
    if(tempcode2 == 'C'){
      ans = (5.0 / 9.0) * (temp - 32);
    } else if(tempcode2 == 'R'){
      ans = (4.0 / 9.0) * (temp - 32);
    } else if(tempcode2 == 'F'){
      cout << "Imagine converting Fahrenheit to Fahrenheit" << endl;
    } else if(tempcode2 == 'K'){
      ans = (5.0 / 9.0) * (temp - 32) + 273.15;
    }
      
  } else if(tempcode1 == 'K'){
    
    if(tempcode2 == 'C'){
      ans = temp - 273.15;
    } else if(tempcode2 == 'R'){
      ans = (4.0 / 5.0) * (temp - 273.15);
    } else if(tempcode2 == 'F'){
      ans = (9.0 / 5.0) * (temp - 273.15) + 32;
    } else if(tempcode2 == 'K'){
      cout << "Imagine converting Kelvin to Kelvin" << endl;
    }
      
  }
  
  cout << "The temperature answer is ";
  cout << ans;
  
  /*
  Credit :
  Coded by Ibnu Dzumirrotin (https://github.com/Ibnudz)
  */
}