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lecture4_more_programming - Learning More About Programming...

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9/27/2010 1 Ò Learning More About Programming Variables Ò Variables are places to store values (such as sensor readings) for later use, or for use in calculations. There are three main steps involved in using a variable: Ò Create (“declare”) the variable Ò Assign the variable a value Ò Use the variable to access the stored value Variables Ò The variable “speed” is used to store a number, and then retrieve and use that value when it is called for later on Ò It stores a number given by the programmer, and retrieves it twice in the two different places that it is used, once for each of the motor commands Ò This way both motors are set to the same value Ò You would only need to change one line of code to change both motor powers Ò The ability to store sensor values (measured by the robot, rather than set by the programmer) adds invaluable new capabilities Ò It gives the robot the ability to take measurements in one place and deliver them in another Ò Robot can do its own calculations using stored values
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