Return statement - Advanced Functions, Recursion, Arrays, and Pointers | Coursera

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Return statement

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C for Everyone: Programming Fundamentals

加州大学圣克鲁兹分校

4.6（1,300 個評分） | 38K 名學生已註冊

This course is for everyone. In the new world we live in, coding is a universally valuable skill, whether you're a scientist, artist, or a humanist. Algorithms are everywhere, and we all have to understand how they work. The C language is particularly well suited as an introduction to coding: It's a tried-and-true language, and it allows you to understand computing processes at a deep level. No prior knowledge of coding is needed for this course. We'll start at the beginning. The time estimated time commitment for this course is five hours a week for five weeks.

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4.6（1,300 個評分）

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RB

Apr 20, 2020

It was really great experience studying in this course.The professor is great, but the part of the course is its well managed assignments and quizzes. Again Hats off to whole team.\n\nThanks.

KN

Apr 11, 2020

A very well arranged course. YES, it is for EVERYONE but only if THE ONE is willing to learn something because it taught everything clearly but Practice is only the student's responsibility

從本節課中

Advanced Functions, Recursion, Arrays, and Pointers

A continuation of functions, recursion, arrays, and pointers.

Function definition6:23

Function code example4:40

Return statement4:18

Function prototype4:01

Function Prototype - code example5:26

Function variables—with call-by-value explained7:32

Function definitions and scope rules5:32

教學方

Ira Pohl
Professor

以免費的價格試聽課程

腳本

So an important part of understanding functions, is the use of the return statement. A return statement is a flow of control keyword return, and we've already seen it. We've seen it right from the get-go with our first programs where we always say at the end of main returns of zero, this convention. It can be not used, but it's better style to use it explicitly. So at the end of a function in main, what it's meaning is that main returns of value zero, but where does return it to? Main is the program that you're executing, it returns it to the operating system, and it's used by the operating system sometimes to figure out whether if there was an error in the program. So return of zero means the program finished in an expected or orderly way, a normal exit. The syntax of the return statement is either its return semicolon, no expression return of semicolon, or its return of an expression semicolon. Here are three simple examples, the return of semi-colon, return of zero, return of the expression a plus b. Notice, I did not need to parenthesize this, but by parenthesizing that made it clearer. So I could just as well I have written zero. I could have parenthesized even as simple integer constant like zero. So people generally when they're returning expression even if they don't need to, because of clarity stylistically they do use parenthesization. Let's see a simple use in a function. Here's a function, self-explanatory I've called it cube. It means that I'll take a value which is a double, I'll multiply it three times, so I get the cube of the past in parameter x. So double is what's returned, that's the appropriate value. If these do not line up, if this expression is not double then there's going to be some conversion. Conversion rules can be messy and complicated and generally want to avoid conversions, but we will expect a conversion. How can it be used? We can call it, like a is replaced by the cube of 3.5. So internally this gets computed three, that's 3.5 times 3.5 times 2.5, and that is the value returned to a. Notice by the way, just to make that last point clear, if I had said a as returned q of 3, what actually happens is three is an int converts to double and a ends up being the double 27.0 not the integer 27. That's return, return is fairly simple.

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