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You need to understand a subroutine's ____ in order to use it.
a. internal structure
b. local variables
c. programming style
d. interface
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∙ 14y ago
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Mention the importance of subroutines in programming?
A subroutine is typically defined as being a function or procedure that can be invoked at any point in a program, causing the procedural execution to branch to the subroutine. This is not unlike a goto or jump statement, however subroutines also make use of the program's call stack to allow values (arguments or parameters) to be passed to the subroutine, including the address of the caller so that execution can return to the point of the call when the subroutine falls from scope. A subroutine can also (optionally) return a single value to the caller, known as the return value. Return values are temporary and will fall from scope when the expression that invoked the subroutine falls from scope. However, by assigning a subroutine to a variable, the return value can be stored in that variable and can then used in subsequent expressions. Subroutines pop their arguments from the stack and construct local variables or references from the argument values. Arguments passed by reference can therefore be used to return values through the referenced values. Values returned in this manner are known as output arguments. Subroutines that use output arguments often use the subroutine's temporary return value to indicate any errors that occurred within the subroutine, with zero indicating success (no error).
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