print_num.c

void print_num(int n)
{
    unsigned char buf[12] = {0}, *p = buf + 10;
    char minus = (n < 0);
    if(n < 0) n = -n;
    while(n)
    {
        *p-- = '0' + (n % 10);
        n /= 10;
    }
    if(!*++p) *--p = '0';
    if(minus) *--p = '-';
    uart_puts(p);
}