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Variables

Variables. Here we go. How does a computer remember things?. To make our programs remember things, we store information as “variables” Work the same way as variables in math go x = 5; x = 20; bestName = “ Guzy ”;. Computers have memory? .

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Variables

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  1. Variables Here we go

  2. How does a computer remember things? • To make our programs remember things, we store information as “variables” • Work the same way as variables in math go • x = 5; • x = 20; • bestName = “Guzy”;

  3. Computers have memory? • Each variable stores its value in MEMORY, in a reserved spot of a specific size • Different variable types require different memory sizes • So we must DECLARE a variable to reserve the spot before we can use it to store information

  4. Variable types • INTEGER- Integer numbers, positive AND negative. But no decimals. • STRING- Stores words, names, even novelty license plates like “1WOOO1” • CHAR- Characters, single letters, or number, or symbols. • FLOAT or DOUBLE- Decimals, take up a huge amount of space compared to integers • BOOLEAN- True or False values (more on this another time)

  5. Special quirk of javascript • Is what we call “Loosely typed”, we make variables without stating what type they are • You can declare a variable, and give it any type later on • To declare a variable: • varmyVar; • varmyVar = “Guzy”; • varmyVar = new String;

  6. TO DO • Declare 6 variables at the top • Make 3 of each: INTEGER, STRING in the INIT section of the code, using names and made up grades • Display on the screen using the fillText command the following: • Each name with the corresponding grade, 1 line per person • Calculate the average

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