To call it, a programmer uses the function's identifier, the value to be passed into the function, and a variable for the function to return a value into, for example: celsius ← f_to_c(32 ...

One of the easiest ways to change your program involve subroutines. Most CPUs have some facility for call and return (although ... in the register. ; Simple example ; Convert decimal # at istring ...

There are two types of subroutine: Procedures perform a specific task but do not return a value ... again in other parts of the program. For example, the same variable name could be used in ...