disregard my previous post,

You can delete your posts.

here's my new circuit schem.

An easier to read version of your schematic:

Before I invest more time analyzing your circuit. Have you checked the behavior if the count is 6-9 and you try to add 5?

 

Something like this perhaps should work...

 

so i can only add 0-9 and i want it to be 0-99. here's my new circuit schem.

Did you ever figure out that your circuit won't work? If you have an adder circuit after the counter, if the counter had a count of 5-9, the output from the adder would be an invalid code. As I mentioned in my previous post:

Have you checked the behavior if the count is 6-9 and you try to add 5?

 

Looks like the TS just ignored your advice to check if the circuit works right.

I will work on the circuit as it didn't increment properly with the units (6-9) when +5 is pressed.

Allen

 

Looks like the TS just ignored your advice to check if the circuit works right.

I will work on the circuit as it didn't increment properly with the units (6-9) when +5 is pressed.

Personally, I don't think it's worth working on. The idea was seriously flawed.

By adding the +5 in logic outside of the counter, a lot of glue would have been required to deal with invalid counts and the revised count needed to be loaded back into the counter. Doing that would require adding some latches to save the updated count and somehow load it into the counter before the next increment of 1 or 5.