C clock program

Question

I was trying to create a clock program with c using the eclipse ide. When I run the program it keeps executing every single count. I used system("cls"). Also tried "clear" It shows no error but it is not working. I want the screen cleared after every count. It is showing a ⍰ symbol sometimes. https://i.stack.imgur.com/0ElDL.png ---This is what I got.

int main(void)
{

    int hour,minute,second;
    hour=minute=second=0; 
    setbuf(stdout,NULL);  

    while(1) 
    {

        system("cls");  

        printf("%02d:%02d:%02d\n",hour,minute,second);  

        fflush(stdout); 

        second++;  

        if(second==60)

        {
            minute += 1; 
            second=0;   
        }

        if(minute==60)

        {
            hour += 1; 
            minute=0; 
        }

        if(hour==24)

        {
            hour=0;
            minute=0;
            second=0;

        }

        sleep(1); 
    }

       return 0;

.

Does this answer your question? [How do you clear the console screen in C?](https://stackoverflow.com/questions/2347770/how-do-you-clear-the-console-screen-in-c) — Harish, Nov 16 '21 at 06:58
What does "it is not working" mean? Please describe what happens and what you expected to happen. — Ken Y-N, Nov 16 '21 at 07:01
Since you make `stdout` unbuffered, you don't need the `fflush` call. — Some programmer dude, Nov 16 '21 at 07:06
What operating system do you use? `system("clear")` in Linux, `system("cls")` should work in Windows. — Piotr Henryk Dabrowski, Nov 16 '21 at 07:12
Side note: this clock will eventually go out of sync. Each cycle will take 1 second of sleep and then some more time for code execution, which will add up to the clock being late. You should probably read the system clock each time, or at least sync with it occasionally. — Piotr Henryk Dabrowski, Nov 16 '21 at 07:31
Are you actually running this in the command prompt or are you looking at the Eclipse output window? — General Grievance, Nov 16 '21 at 13:51
It's Java, but this may still apply: https://stackoverflow.com/questions/37301530/how-to-clear-console-in-java-eclipse — General Grievance, Nov 17 '21 at 13:17

score 0 · Answer 1 · answered Nov 16 '21 at 06:56

0

try using system("clear");

answered Nov 16 '21 at 06:56

Harish

85
14

Not Working,Harish – Athul Krishna.S Nov 16 '21 at 07:18
@AthulKrishna.S Please add details as requested in the comments on your question. Until then, we can only guess at what you want. – General Grievance Nov 16 '21 at 13:52

score 0 · Answer 2 · answered Nov 16 '21 at 07:02

0

According to example published above you need only one line to display clock. It's easier to add carriage return:

while(1) 
{
        printf("%02d:%02d:%02d\r",hour,minute,second);  
        fflush(stdout); 
        ...
}

answered Nov 16 '21 at 07:02

nvf

465
1
7

Still not working – Athul Krishna.S Nov 16 '21 at 07:24

C clock program

2 Answers2