I have a question about scan 7-segment display with four 7-segement LED display, to display counting down timer with variable settings. And I have to show that using Turbo C program via a module of scan 7-segment connected to the parallel port of a computer. What I do not know is that is there a function of time in C that will will simulate the time that I entered? Just like the count down in a time bomb. For example, if I enter in the keyboard 05:30, it must count from 05:30 to 00:00. The left 2-digit in minutes and the right 2-digit in seconds. Please give me the function of time and how will I be able to display it?