public static void Main()
Console.WriteLine("Temperature Converter");
Console.WriteLine("Enter the starting temperature (number)");
first = Double.Parse(Console.ReadLine());
Console.WriteLine("Choose its temperature unit (a=Fahrenheit, b=Celsius, or c=Kelvin)");
unit = Convert.ToString(Console.ReadLine());
Console.WriteLine("Choose the unit you want to convert it to (a=Fahrenheit, b=Celsius, or c=Kelvin)");
second = Convert.ToString(Console.ReadLine());
if (unit=="a" && second=="b")
Console.WriteLine("Your current temperature is now in Celsius:");
Console.WriteLine(answer);
if (unit=="a" && second=="c")
answer=(first-32)*5/9+273.15;
Console.WriteLine("Your current temperature is now in Kelvin:");
Console.WriteLine(answer);
if (unit=="b" && second=="a")
Console.WriteLine("Your current temperature is now in Fahrenheit:");
Console.WriteLine(answer);
if (unit=="b" && second=="c")
Console.WriteLine("Your current temperature is now in Kelvin:");
Console.WriteLine(answer);
if (unit=="c" && second=="a")
answer=(first-273.15)*9/5+32;
Console.WriteLine("Your current temperature is now in Kelvin:");
Console.WriteLine(answer);
if (unit=="c" && second=="b")
Console.WriteLine("Your current temperature is now in Celsius: ");
Console.WriteLine(answer);
if (unit=="a" && second=="a")
Console.WriteLine("You cannot convert that ");
if (unit=="b" && second=="b")
Console.WriteLine("You cannot convert that ");
if (unit=="c" && second=="c")
Console.WriteLine("You cannot convert that ");