From mboxrd@z Thu Jan  1 00:00:00 1970
From: Zhenwen Xu <helight.xu@gmail.com>
Subject: Re: Division in loop
Date: Wed, 9 Sep 2009 08:45:31 +0800
Message-ID: <20090909004531.GA3264@helight>
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To: Randi Botse <nightdecoder@gmail.com>
Cc: linux-c-programming@vger.kernel.org

On Tue, Sep 08, 2009 at 09:40:30PM +0700, Randi Botse wrote:
> hi all,
> 
> ....
> int fd, fdp;
> unsigned int size;
> int progress = 0;
> size_t bytes = 0;
> void *buffer;
> ....
> 
> /* open fd from a device then create fdp, allocate buffer,, etc. */
> 
> while (bytes < size) {
>         ret = read(fd, buffer + bytes, size - bytes);
>         if (ret == -1) {
>             perror("read");
>             return -1;
>         }
>         ret = write(fdp, buffer + bytes, ret);
>         if (ret == -1) {
>             perror("write");
>             return -1;
>         }
>         bytes += ret;
> 
>         progress = (int) ((bytes / size) * 100);
>         printf("\rcompleted: %i%%", progress);

printf them all and check them:

         printf("\rcompleted: %i%% bytes: %d size: %d \n", progress, bytes, size);

>         fflush(stdout);
>     }
> 
> ....
> 
> I run this loop to receive some data, the printf() seem not updated,
> the progress output is
> always in it's initial value until the loop was finished. but when i do...
> 
> progress = (int) ((bytes / 2) * 100); /* change size to 2 (or random number) */
> 
> then it's works... what's wrong here???
> --
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