Question

I would like to create a small function, which should show the current status in percentage in the console. The function should only show the current value in the line.
So I have to remove the last output. Is that possible? The best case would be some ANSI C stuff, the program should work on linux and windows.

I have found some escape sequences like "\033[J", but it dose not work.

Edit

Well I tried it with:

void PrintProcessBar(int i, int n) {
    float ratio = i / (float)n;    
    printf("%.3d\b\b", (int)(ratio * 100));
    fflush(stdout);
}

But it just print lots of zeros… What went wrong? If I use three \b I get nothing.

Solution

float ratio = (i / (float)n) * 100;
printf("\b\b\b\b");
fflush(stdout);
printf("%.3d%c", (int)ratio, 37);        
fflush(stdout);

i = current position.
n = max runs.

I use 4 \b because, at the first call of the function it will remove 4 spaces.

Greetz.

Answer 1

\b is the escape sequence for backspace. you can use it with spaces to delete a line.

For example:

printf("98%");
fflush(stdout);
// sleep some time
printf("\b\b\b99%");
fflush(stdout);

This should print 98%, and then replace it with 99%.