Counting letters in a .txt file (C)

Question

https://code.sololearn.com/cw3EQdt92Cfd/#c
im working on a program that counts letters, lines and words in a txt file but it counts uncorrectly the number of letters, what am i doing wrong?

Answer 1

The functions from <ctype.h> might help in deciding whether a character was alphabet, digit, spaces etc. I'm not sure about the way you check the character type, this is why I think you might need to check functions from that header file

http://www.cplusplus.com/reference/cctype/