comparing character and int

[menson]

I want to write a function counting number of letters in the string.

for example:

Enter a string: 2010 is happy
Number of letter: 7

Actually, I want to know how to do that...Since all are chacacters in the string and I have no idea to start with...


Thank you very much.

[mcleano]

Take a look at these:
http://www.cplusplus.com/reference/clibrary/cctype/isalnum/
http://www.cplusplus.com/reference/clibrary/cctype/isalpha/

EDIT ** Also: http://www.cplusplus.com/reference/clibrary/cctype/isspace/