change from ASCII code to integer

[guest]

how can I change a number from ASCII code to integer.
e.g. I want to different function can be chosen by typing 1, 2 or 3 in PC and the PIC read it through RS232. but the problem was:
when I typed '1' and got it through RS232 by getchar(). The '1' is stored as ASCII code 49, but I want to use '1' to classify cases..
so, I have to translate the ASCII code of '1' back to integer 1.

please tell me how. thanks

[Ttelmah]

If it is only a single digit, then just use:

VAL=(ASC_CHAR-'0');

For a complete 'string' (multiple characters), look at 'atoi'.

Best Wishes

[luckyluke]

numbers begin from 48 (decimal for 0) to 57 (decimal for 9)
if you sbstract 48 from what you get with getchar() you will have the number