Declaration - A statement of a variable name, data type and sometimes initial value. Must be done before variable is used., Input & output - Taking data into the program or producing data from the program., Assignment - Setting a variable to a value., Variables - part of the program that can store data while the program is running, Local variable - Used in one sub-routine only, Global Variable - Used anywhere in the program, Constants - Like a variable but it can't change e.g. pi, sub-routines - A chunk of a program. The main program is broken down into these.,

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