虽然循环问题？ [英] While loop problem ?

问题描述

为什么循环打印你好4次，当我给三个字charcter ..... olso最后一个hello打印在新线.....



我尝试过：

why does loop prints hello 4 times when i give three word charcter.....olso the last hello prints in new line.....

What I have tried:

int main()
{
  int c;
  while ((c = getchar()) != EOF)
  {
    putchar(c);   

    printf("hello");
  }
}

推荐答案

因为你没有输入3个字符 - 你键入4，如果你包括最后的ENTER， getc （因此 getchar 调用 getc on stdin ）。它也是一个角色'\ n'。这很容易检查：

Because you didn't type 3 characters - you typed 4, if you include the ENTER at the end, which getc (and thus getchar which calls getc on stdin) does. It comes through as a character '\n' as well. It's easy to check:

while ((c = getchar()) != EOF)
  {
    printf("\"%c\"", c);
  }

当你不理解你的代码在做什么或为什么它做它的作用时，答案是 debugger 。

使用调试器查看代码正在执行的操作。只需设置断点并查看代码执行情况，调试器允许您逐行执行第1行并在执行时检查变量，这是一个令人难以置信的学习工具。



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 [ ^ ]



调试器在这里向您展示您的代码在做什么你的任务是与它应该做的事情进行比较。

调试器中没有魔法，它没有发现错误，它只是帮助你。当代码没有达到预期的效果时，你就会接近一个错误。

When you don't understand what your code is doing or why it does what it does, the answer is debugger.
Use the debugger 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, it is an incredible learning tool.

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 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 find bugs, it just help you to. When the code don't do what is expected, you are close to a bug.

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