Java Programming for Beginners

Exploring separate cases - C, K, and F

So I guess we're going to need separate cases for each of the possible or valid input types, that is, capital F for Fahrenheit, C for Celsius, K for Kelvin. We should probably also handle a default case. Let's start off by writing the default case. We'll use System.exit and exit with 1, which is technically an error code:

switch(inputType) 
{ 
    case 'F': 
    case 'C': 
    case 'K': 
    default: 
        System.exit(1); 

System.exit basically quits our program. It tells it to stop executing and passes to the operating system or whatever's up in the hierarchy.

In this case, the program will just stop. Because it's the default case, we only expect to enter it if the user has failed to enter F, C, or K, which are our valid input ...