Temperature Converter In C++

This program is used to convert the  temperature from one scale to another. When user inputs the temperature in one scale  then it outputs the equivalence of other two scales of temperature.

There are some formulas that are used in the  program are listed below:

Fahrenheit = ( 1.8 * Celsius ) + 32   //celsius into fahrenheit

Celsius = ( Fahrenheit - 32 ) / 1.8   //fahrenheit into celsius

Kelvin = Celsius + 273.15             //Celsius into Kelvin

Celsius = Kelvin - 273.15             //Kelvin into Celsius

Kelvin = Fahrenheit + 459.67)× 5 / 9  //Fahrenheit into Kelvin

Fahrenheit = Kelvin × 9 / 5 - 459.67  //Kelvin to Fahrenheit

#include 
using namespace std;

int main()
{
int a = 0;
cout << "   This program is used to convert the temperature from one scale to another.\n\n\n";
double cel, far, kel;
char inscale, outscale;

while (a == 0)
{
cout << "Enter the input scale in which you want to enter the temperature (c/f/k) : ";
cin >> inscale;

inscale = tolower(inscale);

if (inscale == 'c' || inscale == 'f' || inscale == 'k')
{
if (inscale == 'c')
{
cout << "Enter the temperature in Celsius : ";
cin >> cel;
if (cel)
{
far = (cel * 9 / 5.0) + 32;
kel = cel + 273.15;
cout << "\n" << "Temperature in Fahrenheit is : " << far;
cout << "\n" << "Temperature in Kelvin is : " << kel << endl << endl;
}
else
break;
}
else if (inscale == 'f')
{
cout << "Enter the temperature in Fahrenheit : ";
cin >> far;
if (far)
{
cel = (far - 32) * 5 / 9;
kel = ((far - 32) * 5 / 9) + 273.15;
cout << "\n" << "Temperature in Kelvin is :" << kel;
cout << "\n" << "Temperature in Celsius is : " << cel << endl << endl;
}
else
break;
}
else if (inscale == 'k')
{
cout << "Enter the temperature in Kelvin : ";
cin >> kel;
if (kel)
{
cel = kel - 273.15;
far = ((kel - 273.15) * 9 / 5.0) + 32;
cout << "\n" << "Temperature in Fahrenheit is : " << far;
cout << "\n" << "Temperature in Celsius is : " << cel << endl << endl;
}
else
break;
}
a = 1;
}
else
{
cout << "Please enter a correct input scale!!!\n\n";
continue;
}
}
system("pause");
return 0;
}

Click on the below link to download the executable file of Temperature Converter In C++

Temperature Converter.zip