Computer Science Programming Basics in Ruby: Exploring by Ophir Frieder

By Ophir Frieder

For those who recognize simple high-school math, you could quick research and practice the center ideas of computing device technological know-how with this concise, hands-on ebook. Led by way of a crew of specialists, you will speedy comprehend the variation among desktop technological know-how and desktop programming, and you may find out how algorithms assist you clear up computing difficulties. every one bankruptcy builds on fabric brought previous within the ebook, so that you can grasp one center development block earlier than relocating directly to the following. you are going to discover basic subject matters akin to loops, arrays, gadgets, and sessions, utilizing the easy-to-learn Ruby programming language. Then you will positioned every thing jointly within the final bankruptcy through programming an easy video game of tic-tac-toe.

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Info | 33 Gem of Wisdom When you get an error message, do not just try the program again. This may work with your toaster, where you just unplug it and plug it back in, but with software development, it rarely, if ever, works. Figure out the problem, make a correction, and then see if it works. Example 3-1. to_i # Convert width to integer area = length * width # Calculate rectangle area puts area # Display area Step 4: Test the Code in the Computer Similarly those who are adventurous can type the code lines from step 3 into a file and run the code from there.

Here we have a wide variety of possibilities, so we restrict ourselves to the most prevalent data coding. The simplest one is the integer. In this interpretation, the bit string represents a positive numerical value in radix 2. This means that each string represents a binary number, where each digit is weighed by the proper power of two, starting from zero on the extreme right (end of the string) and proceeding to the left. Thus, the string 01011101 will have the meaning 1 × 20 + 0 × 21 + 1 × 22 + 1 × 23 + 1 × 24 + 0 × 25 + 1 × 26 + 0 × 27, where × is the multiplication sign.

Arithmetic expressions that operate on integers will always evaluate to integer form. This happens even with division, where the result would otherwise be a decimal. Ruby does this by truncating the arithmetic result (chopping off the decimal place and all the digits to the right of it). 5. irb(main):003:0> 5 / 2 => 2 If you get a wrong value using this computation in a program, then your final result will likely be erroneous, too. 7 Mixing Data Types Ruby will always try to remain in the same data type as its operands.

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