Some basic understanding of function calls

Functions are a very important concept in program design. They can encapsulate relatively independent logic into a simple call, increasing the reusability of the logic. From a usage perspective, functions emphasize input and output; they accept parameters, perform a specific process, and then output the result. A function is a type of subprogram, and it is also a type of callable unit. A programmer can write a function in source code that is compiled to machine code that implements similar se...