Arizona State University (ASU) CSE240 Introduction To Programming Languages Midterm Practice Exam

The execution of a function is initiated by a call to that function, which includes its actual parameters. When a function is called, the program control transfers to the function, and the code within the function begins to execute. This is crucial because it means that the function only runs when specifically requested, allowing for modular programming and the reuse of code. In programming, simply declaring a function does not execute it; the function needs to be invoked in order for the code within it to run. This mechanism supports various programming paradigms and allows programmers to define complex behavior that can be executed at different points in a program's execution flow. Additionally, while some languages may execute specific code automatically at program start, this is not a characteristic feature of functions themselves, as functions are not executed until they are called. The same goes for defining variables, which could be necessary for a function to operate but do not trigger the actual execution of the function.