C程序编译但不执行 [英] C program compiles but does not execute

问题描述

我成功安装了NetBeans for C，但我不知道出什么问题了，因为每当我编写任何代码时，它都会说"build success"，但不会执行. 当我按下运行按钮时，什么都没有发生，Netbeans只是编译代码，但屏幕上什么都没有显示.

I installed NetBeans for C successfully, but I don't know what is wrong because whenever I write any code it says "build successful" but it does not execute. Nothing happens when I hit the run button, Netbeans just compiles the code but nothing is displayed on screen.

以下是简单的代码:

int main(void) {
    int a=0;
    printf("input any number");
    scanf("%d",&a);
    return (EXIT_SUCCESS);
}

这是它的编译:

""/C/MinGW/msys/1.0/bin/make.exe" -f nbproject/Makefile-Debug.mk QMAKE= SUBPROJECTS= .build-conf
make.exe[1]: Entering directory `/c/Users/timekeeper/Documents/NetBeansProjects/ft'
"/C/MinGW/msys/1.0/bin/make.exe"  -f nbproject/Makefile-Debug.mk dist/Debug/MinGW-Windows/ft.exe
make.exe[2]: Entering directory `/c/Users/timekeeper/Documents/NetBeansProjects/ft'
mkdir -p build/Debug/MinGW-Windows
rm -f "build/Debug/MinGW-Windows/main.o.d"
gcc -std=c99   -c -g -MMD -MP -MF "build/Debug/MinGW-Windows/main.o.d" -o build/Debug/MinGW-Windows/main.o main.c
mkdir -p dist/Debug/MinGW-Windows
gcc -std=c99    -o dist/Debug/MinGW-Windows/ft build/Debug/MinGW-Windows/main.o 
make.exe[2]: Leaving directory `/c/Users/timekeeper/Documents/NetBeansProjects/ft'
make.exe[1]: Leaving directory `/c/Users/timekeeper/Documents/NetBeansProjects/ft'

BUILD SUCCESSFUL (total time: 34s)
""

我该怎么办? 预先感谢

What should i do? Thanks in advance

推荐答案

stdout流是行缓冲的.这意味着您遇到fwrite或printf等到stdout的任何内容，直到遇到换行符(\n)时，才真正写入到终端.

The stdout stream is line-buffered. That means whatever you fwrite or printf, etc. to stdout will not actually be written to your terminal until a newline character (\n) is encountered.

因此，您的程序将字符串缓冲了，并在scanf上被阻塞，等待您从stdin输入.一旦发生这种情况，您的控制台窗口就会关闭，并且您再也看不到打印内容.

So your program has your string buffered, and is blocked on the scanf, waiting for your input from stdin. As soon as this happens, your console window is closing, and you never see the print.

要解决此问题，请在字符串末尾添加换行符:

To remedy this, either add a newline character at the end of your string:

printf("input any number:\n");        // Newline at end of string

或手动导致刷新stdout:

printf("input any number: ");
fflush(stdout);                       // Force stdout to be flushed to the console

此外，我假设(total time: 34s)数字包括程序等待您键入内容的时间.您非常耐心，大约34秒后，终于将键盘上的东西捣碎了，然后程序结束并且控制台窗口关闭了.

Furthermore, I'm assuming that the (total time: 34s) figure includes the time the program was waiting for you to type something. You were incredibly patient, and after ~34 seconds, finally mashed something on the keyboard, after which the program ended and the console window closed.

或者，如果Netbeans没有打开单独的控制台窗口，则这全部发生在Netbeans IDE的那些MDI窗格中.

Or, if Netbeans isn't opening a separate console window, this is all happening in one of those MDI panes of the Netbeans IDE.

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