与get_char（）相关的问题 [英] Question related to get_char()

问题描述

为什么char（）总是在我们多次调用它时输入.....下面的代码只是第一次询问用户输入....



我尝试过：

why doesnt get char() always take input when we call it multiple times.....the following code below only ask user input for first time....

What I have tried:

int main(){
int c;
printf("Enter character");
c = getchar();
c=getchar();
c=getchar();

putchar(c);

}

推荐答案

getchar - C ++参考 [ ^ 等待按下一个键并在发生这种情况时返回代码或输入队列中已有一个键。



你正在调用它三次并将返回值赋给变量 c 。所以前两个字符被忽略，只有第​​三个字符在屏幕上回显。



如果你想处理多个字符，你必须使用像

getchar - C++ Reference[^] waits for a key to be pressed and returns the code when that happens or there is already a key in the input queue.

You are calling it three times and assign the return value to the variable c. So the first two characters are ignored and only the third one is echoed on the screen.

If you want to process multiple characters you have to use a loop like

do
{
    c = getchar();
    putchar(c);
}
while (c != 0x0d)

引用：

下面的代码只是第一次询问用户输入....

the following code below only ask user input for first time....

要求用户输入

Asking for user input is

printf("Enter character");

您希望打印这句话多少次？

使用调试器，设置一个断点并按照一步一步的执行，并注意变量 c 。



当你穿上不知道你的代码在做什么或为什么它做它做的事情，答案是调试器。

使用调试器来查看你的代码在做什么。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。

How many times do you expect this sentence to be printed ?
With the debugger, put a breakpoint and follow step by step execution and pay attention to the variablr c.

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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