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Survivor Ultimate Edition. Exercise 28: Boolean Practice The logic combinations you learned from the last exercise are called 'Boolean' logic expressions. Boolean logic is used everywhere in programming. It is a fundamental part of computation, and knowing them very well is akin to knowing your scales in music. In this exercise you will take the logic exercises you memorized and start trying them out in Ruby. Take each of these logic problems and write what you think the answer will be.

In each case it will be either true or false. Once you have the answers written down, you will start Ruby in your terminal and type each logic problem in to confirm your answers.

• true && true • false && true • 1 == 1 && 2 == 1 • 'test' == 'test' • 1 == 1 2!= 1 • true && 1 == 1 • false && 0!= 0 • true 1 == 1 • 'test' == 'testing' • 1!= 0 && 2 == 1 • 'test'!= 'testing' • 'test' == 1 •!(true && false) •!(1 == 1 && 0!= 1) •!(10 == 1 1000 == 1000) •!(1!= 10 3 == 4) •!('testing' == 'testing' && 'Zed' == 'Cool Guy') • 1 == 1 && (!('testing' == 1 1 == 0)) • 'chunky' == 'bacon' && (!(3 == 4 3 == 3)) • 3 == 3 && (!('testing' == 'testing' 'Ruby' == 'Fun')) I will also give you a trick to help you figure out the more complicated ones toward the end. Whenever you see these Boolean logic statements, you can solve them easily by this simple process: • Find an equality test (== or!=) and replace it with its truth. • Find each &&/ inside parentheses and solve those first. And invert it. • Find any remaining &&/ and solve it.

• When you are done you should have true or false. I will demonstrate with a variation on #20: 3!= 4 &&! ( 'testing'!= 'test' 'Ruby' == 'Ruby' ) Here's me going through each of the steps and showing you the translation until I've boiled it down to a single result: • Solve each equality test: 3!= 4 is true: true &&!('testing'!= 'test' 'Ruby' == 'Ruby') 'testing'!= 'test' is true: true &&!(true 'Ruby' == 'Ruby') 'Ruby' == 'Ruby': true &&!(true true) • Find each &&/ in parentheses (): (true true) is true: true &&!(true) • Find each! And invert it:!(true) is false: true && false • Find any remaining &&/ and solve them: true && false is false With that we're done and know the result is false. Study Drills • There are a lot of operators in Ruby similar to!= and ==. Try to find as many 'equality operators' as you can.

They should be like. Rybka 4 Activation Key. The Firmware Package From Mikrotik. Common Student Questions Why does 'test' && 'test' return 'test' or 1 && 1 return 1 instead of true? Ruby and many languages like to return one of the operands to their Boolean expressions rather than just true or false.