Computer Science Programming Basics in Ruby: Exploring by Ophir Frieder
By Ophir Frieder
In case you comprehend uncomplicated high-school math, you could speedy study and follow the center thoughts of desktop technological know-how with this concise, hands-on e-book. Led via a staff of specialists, you will quick comprehend the adaptation among computing device technology and laptop programming, and you can learn the way algorithms assist you remedy computing difficulties. each one bankruptcy builds on fabric brought past within the publication, so that you can grasp one middle construction block earlier than relocating directly to the following. you will discover primary subject matters similar to loops, arrays, gadgets, and sessions, utilizing the easy-to-learn Ruby programming language. Then you will positioned every little thing jointly within the final bankruptcy through programming an easy video game of tic-tac-toe.
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Additional resources for Computer Science Programming Basics in Ruby: Exploring Concepts and Curriculum with Ruby
See Chapter 9 for more information. • Constant: A variable that is set once and never changed. • Initialize: To assign a value to a variable when the variable is created. • Data class: Information about the variable that defines the possible values a variable can have and what operations can be performed using it. A more complete de‐ scription is presented in Chapter 8. • Integer: A class that defines a whole number. Ruby recognizes two classes: — Fixnum: An integer with a limited range. In 32-bit systems, the range –2,147,483,648 to 2,147,483,647.
Most com‐ puters have these stored in individually addressable units of eight bits, called bytes. The bytes in turn can be strung together to form longer strings. For historical reasons, a group of two consecutive bytes is called a half word, four bytes (32 bits) are called a word, and 64 bytes are called a double or long word. info | 17 The meaning of the strings of bits is just that—a string of bits. The interpretation of the meaning, however, is dependent on the usage of the string. One important usage is to code an instruction and its parameters.
Scales of magnitude Units Actual size (bytes) Other names Real-world quantities Megabyte (MB) 1,000,000 Million, 106 The King James version of the Bible contains approximately 5 million characters. Mebibyte (MiB) 1,048,576 220 The speed of light is 300 million meters/second. Gigabyte (GB) 1,000,000,000 Billion, 109 At 5% interest, $1 billion would return $50,000,000/ year. 5 times. S. GDP for 2006 was $13 trillion. Tebibyte (TiB) 1,099,511,627,776 240 Global GDP in 2006 was estimated by the World Bank to be $46 trillion.