我的简单C源代码有什么问题？ [英] Whats wrong with my simple C source code ?

问题描述

我写了很多努力的代码。我的意思是我是一个新的程序员，因此即使这对我来说也很难。但是，对于有经验的程序员来说，这是一个单手拍手。我已经发布了以下C源代码。请确认并告诉我什么是错的。一切顺利，直到预期的输出没有被提取。



我尝试过：

I have written this code with lots of efforts. I mean i am a new programmer and thus even this was quite hard for me. But, for experienced programmers this is a one handed clap. I have posted the below C source code. Please acknowledge it and tell me whats wrong. everything goes well until the expected output isnt drawn.

What I have tried:

#include <stdio.h>

int main()
{
	int a;
	int b;
	int c;
	int x;
	x = a+b+c;
	
	printf("Enter a number: ");
	scanf("%d", &a);
	printf("Enter another number: ");
	scanf("%d", &b);
	printf("Enter another new number: ");
	scanf("%d", &c);
	
	printf("The addition of %d, %d and %d is %d !", a, b, c, x);
	
	return 0;
}

推荐答案

您必须在阅读输入后执行添加：

You must perform the addition after reading the input:

printf("Enter a number: ");
scanf("%d", &a);
printf("Enter another number: ");
scanf("%d", &b);
printf("Enter another new number: ");
scanf("%d", &c);
/* Do the calculation after a, b, and c has been read */
x = a+b+c;

你的代码没有你想象的那样，你不明白为什么！



有一个几乎通用的解决方案：在调试器上一步一步地运行你的代码，检查变量。

调试器在这里向您展示您的代码正在做什么，您的任务是与它应该做什么进行比较。

调试器中没有魔法，它不知道你应该做什么，它没有发现错误，它只是通过向你展示正在发生的事情来帮助你。当代码没有达到预期的效果时，你就接近了一个错误。

要查看你的代码在做什么：只需设置断点并查看代码是否正常运行，调试器允许你执行第1行第1行并在执行时检查变量。



此解决方案的缺点：

- 这是一个DIY，你是跟踪问题并找到根源的那个，这导致了解决方案。

这个解决方案的优点：

- 它也是一个很好的学习工具，因为它告诉你现实，你可以看到哪种期望与现实相符。



次要效果

- 你会为自己找到虫子感到自豪。

- 你的学习技巧会提高。



调试器 - 维基百科，免费的百科全书 [ ^ ]



掌握Visual Studio 2010中的调试 - 初学者指南 [ ^ ]

使用Visual Studio 2010进行基本调试 - YouTube [ ^ ]

调试器仅显示您的代码正在执行的操作，您的任务是与应该执行的操作进行比较。



Nota：这不是新手抨击，每个认真的程序员都必须学习调试器，越快越好。

建议：开始使用像这样的简单程序，这是熟悉调试器的一个很好的例子。

Your code do not behave the way you expect, and you don't understand why !

There is an almost universal solution: Run your code on debugger step by step, inspect variables.
The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't know what your is supposed to do, it don't find bugs, it just help you to by showing you what is going on. When the code don't do what is expected, you are close to a bug.
To see what your code is doing: Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute.

The downside of this solution:
- It is a DIY, you are the one tracking the problem and finding its roots, which lead to the solution.
The upside of this solution:
- It is also a great learning tool because it show you reality and you can see which expectation match reality.

secondary effects
- Your will be proud of finding bugs yourself.
- Your learning skills will improve.

Debugger - Wikipedia, the free encyclopedia[^]

Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[^]
Basic Debugging with Visual Studio 2010 - YouTube[^]
The debugger is here to only show you what your code is doing and your task is to compare with what it should do.

Nota: This is not newbie bashing, every serious programmer have to learn debugger, and the sooner, the better.
Advice: Start with short simple programs like this one, it is a good example to get familiar with debugger.

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