I decide to make clock in C as my first "Project", Changing minutes after 60 sec mark went well but when i need to change hours after minutes my secon number of seconds wont reset so it stayis with number 9 stuck until i go to the point of 10 sec.

#include<stdio.h>
#include<Windows.h>

int main ()
{
   int h = 0,m = 59, s = 55;
   int prekid = 1;
        while (prekid == 1)
        {
            printf(" \r H:%d | M: %d | S: %d",h,m,s);
            s  ;
            fflush(stdout);
            if (s == 60)
            {
                m  ;
                s= 0;
            }

            if (m == 60)
            {

                m = 0;
                s= 0;
                h  ;
            }

            sleep(1);
        }

    return 0;
}

CodePudding user response：

Reason for your issue: when line gets shorter, characters from previous, longer line remain on screen.

Solution 1, add enough spaces, 3 in this case I believe, at the end of format string to overwrite extra numbers:

printf(" \r H:%d | M: %d | S: %d   ",h,m,s);

Solution 2, write fixed width output, here with leading zeroes:

printf(" \r H:d | M: d | S: d",h,m,s);

CodePudding user response：

Rathe than print a variable width of text (and leave lefts-overs that caused OP's troubles), print a fixed width:

// printf(" \r H:%d | M: %d | S: %d",h,m,s);
printf("\r H:- | M:- | S:-", h, m, s);

"-" directs printf() to print at least 2 characters, padding on the left with spaces as needed.