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By Jay C.B.

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Comparing two values x == y Note the two equal signs (not just one, as in assignment). Conditional execution if x == y cccc# execute this code else cccc# execute this code end Conditional statements always end with the word end. Putting comments in code files # This is a comment line. X = 1 # Comment to end of line Comments are ignored by the interpreter. 3 A brief introduction to method calls and Ruby objects A lot of what you’ll see and write in Ruby programs are method calls. Method calls sometimes consist simply of the name of a method, in bareword form, possibly followed by one or more arguments to the method.

You need this method so that the string you enter will play nicely with the other numbers when you calculate the Fahrenheit result. rb) print "Hello. rb Hello. Please enter a Celsius value: 100 The Fahrenheit equivalent is 212. rb Hello. Please enter a Celsius value: 23 The Fahrenheit equivalent is 73. NOTE You can shorten the program considerably by consolidating the operations of input, calculation, and output. A compressed rewrite looks like this: SHORTENING THE CODE print "Hello. —but requires anyone reading it to follow a somewhat denser (although shorter) set of expressions.

Getting a line of keyboard input gets string = gets You can assign the input line directly to a variable (the variable string in the second example). to_i To perform arithmetic, you have to make sure you have numbers rather than strings of characters. to_i performs stringto-integer conversion. Comparing two values x == y Note the two equal signs (not just one, as in assignment). Conditional execution if x == y cccc# execute this code else cccc# execute this code end Conditional statements always end with the word end.

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An introduction to categories in computing by Jay C.B.


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