subroutines can be either functions or procedures., Parameters are the values that can be passed to a subroutine, Functions always return values, procedures do not., A library contains many useful extra functions., If you use subroutines there is less likely to be coding errors., Once a subroutine is written it is fully tested it can be reused., A variable with a global scope can be seen everywhere in the program., A variable with a local scope can only be seen in the subroutines they are defined in.,

Why use subroutines and variable scopes

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