What is subroutine? Explain the steps of subroutine execution. Write a subroutine to find the sum of two given positive integers.

A routine or subroutine also referred to as a function, procedure, and subprogram is a portion of code that may be called and executed anywhere in a program. For example, a routine may be used to save a file or display the time. Instead of writing the code for these commonly performed tasks, routines are made and called when these tasks need to be performed.

  • A subroutine is a set of instructions to perform a particular computation used to solve sub problems of more compile problems used for computations performed more than once in a single program or that are required in many different programs.
  • You only need to write it once.
  • Subroutines have names, zero or more parameters, return types, and a body of statements that perform the actual computations return-type subroutine-name( parameter-list ){… statements}

Steps in the execution of the procedure:

  1. Save return address,
  2. Procedure call ,
  3. Execute procedure,
  4. Return.

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