Hi folks.If I write a stopwatch program, is it possible for the user to stop the stopwatch(without closing the program) by clicking a key? And then press another key to continue the timer? Does the program need a function to monitor the keyboard while the program is running? Or are C programs uninterruptible once they have started running? I can imagine situations where I would like to interrupt a program while it's processing a for() loop, and then continue the loop at a later time.Thanks.
Hello ! If you want to interrupt a loop for a programmer's eye put a scanf function at the end of the loop.Then the program won't continue until the user inputs something.The drawback is that even if you want to continue the loop for 100 times,then you must input something 100 times.
So maybe you should look here sleep
The C standard does not have what you want - which is unbuffered input. You can get unbuffered input by working with the operating system, or by using non-standard C libraries, like conio.h.
The way that conio.h does this is to use a loop to monitor the keyboard. When a key is pressed, the C program can take any action you want.
As I understand it, the reason for this is that not all devices that run C allow unbuffered input, and the C standard always wants to be device independent. That could not be done if unbuffered input was allowed as part of the C standard.
A possible workaround is to have the for() loop update a status/log file. You will still have to kill the program, but you will be able to continue where you left off by having the program load the status file. Keep in mind the amount of file writes, maybe updating the file only X amount of times.Originally Posted by cfanatic
