"Hello World"

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来自 Duke University 的课程

Writing, Running, and Fixing Code in C

182 个评分

Duke University

Writing, Running, and Fixing Code in C

182 个评分

课程 2（共 4 门，Specialization Introduction to Programming in C）

Building on the course Programming Fundamentals, this course will teach you how to write code by first planning what your program should do—an important approach for novice and professional programmers. You will learn how to compile and run your program, and then how to test and debug it. This course builds on the Seven Steps you have already learned and provides a framework for systematically testing for problems and fixing them, so you can find and fix problems efficiently.

从本节课中

Compiling and Running

Now that you know how to plan an algorithm and translate it to code, you need to learn how to compile and run it! You will learn about the compiler, which takes the code you wrote and translates it into instructions a machine can execute, which you can then run. You will also learn about different options you can give the compiler, as well as different ways to run your program that give you debugging information.

"Hello World"3:15

Planning isPrime3:49

Generalizing isPrime5:11

Translating isPrime to Code2:25

Comparing Output with diff3:52

与讲师见面

Andrew D. Hilton
Associate Professor of the Practice
Electrical and Computer Engineering
Genevieve M. Lipp
Assistant Professor of the Practice
Electrical and Computer Engineering/Mechanical Engineering and Materials Science
Anne Bracy
Senior Lecturer
Computer Science, Cornell University

In this video we're going to step through the process of writing code in Emacs,

compiling it, and running it.

We're going to walk through assignment four which is to write, compile and

run a program that prints Hello World.

So here I am in the practice programming environment.

And if I do ls, which you may remember shows me the contents of the directory

I'll see a README.

I'm going to emacs the README, and it's going to open up, and

it says that basically what I just said,

we're going to write a program that will print Hello World.

And so to do this I'm going to open a file called hello.c, so

I hit Ctrl+ X, Ctrl + F, prompt me for the file, going to type hello.c.

I need to put my header files at the top, I need to #include them.

So I'm going to #include standard io.h for print F.

I'm going to #include standard lib.h for exit success, and

then I'm going to write main.

Which returns an int and for now takes no parameters.

Later on we'll learn how to have it take command line arguments in course four.

And we want to print Hello World so I'm going to write printf Hello World, and

I want it to have a new line at the end.

So I'm going to put \n, close my parentheses,

put a ;, I'm going to put return EXIT SUCCESS.

I'm going to close my curly braces, and

then I'm going to save this file with Ctrl +X, Ctrl+ S.

And then what I'm going to do is, is I'm going to suspend Emacs so

I can go back to my command prompt.

So if I hit Ctrl+ Z I get back to my shell and I can type commands.

We can also compile inside of Emacs, we'll show you that later when you learn about

mink files and then you don't have to go in and out of Emacs.

Sometimes you want to suspend Emacs anyways.

So I'm going to do gcc -o hello,

just going to tell it to make a program called hello.

I want to give it all of the flags that we give it so

that will be very picky about if I wrote good code, and I want to compile hello.c.

Now gcc didn't print anything, Ttat's good, that means it succeeded.

If I do ls I will see this hello there it's green, which means it's executable,

so we can actually run it.

So of I type ./hello, it will run and print out Hello World.

So now I would add hello.c to git, I'm going to remove hello,

I don't really like adding binaries to git usually.

I'm going to commit and it's going to prompt me for

a message and I'm going to say that I wrote hello world.

Save that and quit, and then I'm going to push and going to grade.

Now I'm going to just note that we did all this with Emacs suspended.

We didn't actually quit Emacs, it's still there, so

if I type fg, we'll be back in Emacs where we were.

If you're doing this and

you suspend Emacs don't start a whole bunch of copies of Emacs for other things.

So if I wanted to keep editing my code I could do that here, but

I finished this assignment.

And I've passed it and now we would move on to the next assignment.

Which is going to involve writing some code that prints out squares.

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