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It's basically a piece of code that can be called and activated
at anytime within a large program. Unlike a function, it does
not have to return any data.
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In computer programming, a subroutine is a sequence of program instructions
that performs a specific task, packaged as a unit. This unit can then be used
in programs wherever that particular task should be performed.
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In computer programming, a subroutine is a sequence of program instructions that performs a specific task, packaged as a unit.