char TO int convert

[MCUprogrammer]

Merry christmas everyone.
I want to ask you something. How do I convert a variable that is char to an int variable ? I'm doing a keypad reading. How do I convert character information to int ? Does CCS C have source code for this?

For example

[Ttelmah]

There is little point in converting to an int32. You only have a single character.
Characters from a keyboard driver are normally in 'ASCII', so the number
1 is actually sent to you as the ASCII character '1' (0x31). To be worth
converting to int32, you would need to assemble a test 'string' of successive
characters, terminate with a '\0' when the enter is pushed, and use
atol on this string to get the whole numeric value being input.
To display the single character' the printf formatter %c will display it
as it is.
To convert a single character, just subtract 0x30 from it.