eclipse中的关于scanf和printf的输入顺序的解决办法

The eclipse console has weird behaviour when used for input with C programs.
I teach C to first year undergraduates and I want them to learn their way through eclipse. But the small silly programs that ask you to input characters have weird behaviour, if you use the eclipse console. It seems like it groups all input and output commands and executes them together...for example...
the following program:

#include <stdio.h>

int main() {
int n = 0;
printf("Gimme a number: ");
scanf ("%d", &n);
printf("/nThe number you entered was %d/n", n);

    return 0;
}

has the following output:

4
Gimme a number: The number you entered was 4

Pretty normal output on any console you'll find, not just with eclipse's one

 

 

instead of

Gimme a number: 4
The number you entered was 4

To obtain this output, you have to flush stdout before scanf'ing the number. The output is flushed either implicitely when a newline character is echoed on the console (printf("/n")) or explicitely with fflush(stdout);

to get the output you wanted use this program :

#include <stdio.h>

int main()  {

    int n = 0;
    printf("Gimme a number: ");
    fflush(stdout);
    scanf ("%d", &n);
    printf("/nThe number you entered was %d/n", n);

    return 0;
}

转自：http://dev.eclipse.org/newslists/news.eclipse.tools.cdt/msg08763.html