在Eclipse-CDT中将fgets（char * c，int i，file * f）与printf（）一起用于C。输出顺序不正确！ [英] Using fgets(char* c, int i, file* f) with printf() for C in Eclipse - CDT. The order of output is not correct.!

问题描述

#include <stdio.h>
enum { max_string = 127 };
static char ch[max_string+1] = "";

int main(int argc, char ** argv){
    printf("Type a String: \n");
    fgets(ch, max_string, stdin);
    printf("the string is: %s", ch);
    return 0;
}

我使用了这段代码，控制台中的输出为

I have used this code and the output in the console was

hello world
Type a String: 
the string is: hello world

hello world是我提供的输入。

'hello world' is the input which I give.

我的问题是为什么在这种情况下不能保留订单？因为printf（）应该在fgets（）之前起作用，但是这里不是那样。我已经在Code :: Blocks中检查了相同的编译器。在那里按顺序工作。
但是对于Eclipse-MARS CDT，我发现它是错误的。

My question is why isn't the order not maintained in this case. As printf() should work before fgets(), but here it isn't that way. I have checked with the same compiler in Code::Blocks. There it works in order. But in case of Eclipse-MARS CDT I find it erroneous.

推荐答案

我假设您正在Windows上运行，并且遇到了长期存在的问题与Windows上的Eclipse CDT中的控制台输出有关。

I assume you're running on Windows, and running into a longstanding problem with console output in Eclipse CDT on Windows.

该错误被标记为 WONTFIX，并且注释说明了为什么它是一个很难解决的问题。他们确实提出了几种解决方法：

The bug is marked as "WONTFIX", and the comments explain why it's a hard problem to fix. They do suggest several workarounds:

• 在每次调用后调用 fflush（stdout） printf 。


• 调用 setvbuf（stdout，NULL，_IONBF，0）会在每次输出操作后显式刷新输出缓冲区。您的程序。


• 使用CDT的实验性 winpty支持，如此处。这试图使Eclipse的控制台具有与实际终端相同的行为，包括行缓冲。

• Call fflush(stdout) after each call to printf. This flushes the output buffer explicitly after each output operation.
• Call setvbuf(stdout, NULL, _IONBF, 0) once at the beginning of your program. This disables output buffering altogether.
• Use CDT's experimental "winpty" support as described here. This attempts to make Eclipse's console have the same behaviour as a real terminal, including line buffering.

我有一个简单得多的解决方案可以建议：使用Eclipse 构建您的程序，但直接从终端（命令提示符）运行。然后，您将获得适当的终端行为，而无需任何变通办法。

I have a much simpler solution to suggest: build your program with Eclipse, but run it directly from a terminal (Command Prompt). Then you will get proper terminal behaviour without any workarounds.

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