printf not printing correctly

Question

I have code that prompts the user for a filename, then displays the contents of the file on the console. However, the printf() statement I use won't print out until the very end, so the user doesn't know to input a filename.

int main(int argc, char * argv[]){
printf("%s", "What file would you like to open?\t");
char filename[100];
scanf("%[^\n]", filename);
printf("You chose:\t%s\n", filename);
return 0;
}

The program currently scans the console, then prints out both printf() statements. The scanf() statement works correctly, just not at the right time. Any idea what my problem is?

EDIT: the program works correctly when run from the command line, but the problem persists in Eclipse.

lccarrasco · Answer 1 · 2012-10-04T02:07:05.010

4

Try adding fflush(stdout); after the first printf, I think the issue is with printf not flushing it's buffer.

EDIT: It seems that it's a known bug in Eclipse, the workaround would be to set the buffer size to zero (check the comments for the code).

edited Oct 04 '12 at 02:07

answered Oct 04 '12 at 01:54

lccarrasco

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is the stdout related? I thought scanf use stdin? – Krypton Oct 04 '12 at 01:59
1

I added that line to the program and it's still not working in Eclipse. – nickhirakawa Oct 04 '12 at 01:59
1

@nh0815 then, can you try adding `setvbuf(stdout, NULL, 0, _IONBF);` before your printf and seeing if that works? – lccarrasco Oct 04 '12 at 02:03

printf not printing correctly

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