Mr T. Mr T. - 1 year ago 101
C Question

printf not printing on console

I’m getting started in the C language. I am using eclipse (juno) as my IDE and installed CDT plugin. I have also unpacked mingw64 (GCC Compiler). I wrote a very simple program to see if it works. This is my code:

#include <stdio.h>

int main()
{
int age;
printf("Hello, please enter your age:\n");
scanf("%d", &age);
printf("Your age is %d", age);
return 0;
}


The problem is that the output buffer is filled with the string value of the first
printf
but does not output it to the console. I have to enter a number, and only then the buffer pours all the data to the console so I see the console something like this:

1
Hello, please enter your age:
Your age is 1


instead of what is expected that is:

Hello, please enter your age:
1
Your age is 1


Now, I found that I can use
fflush(stdout)
after the first
printf
but I don't think that this solution is elegant and even necessary. Any ideas on how I can overcome this?

EDIT - because I'm learning this in my university, I can't use anything that wasn't learned in the course so I can only use
printf
and
scanf


NEW EDIT - I think I have found an explanation for this. As I said, I am outputting to the console view inside Eclipse. The strange thing is that if I compile and run the program from the command line of Windows, I get the wanted result. Therefore, I think that eclipse is actually writing the output to a file and presenting it in the console window. How can I force eclipse to open a real command line window in my run configurations?

Answer Source

OK - apparently this is a known bug of eclipse. This bug is resolved with the resolution of WONT-FIX. have no idea why though. here is the link:
Eclipse C Console Bug

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