What would be considered better code? (in C)

[Monado_III]

Out of these two examples, what would be considered better code, in terms of readability and what is generally considered good practice (and why)? They do the same thing minus one or two formatting things that I'm sure I could work out with enough google searches. (I made isgraph1.txt and isgraph.txt was taken from a book and intentionally cut the comments out)

 

[Monado_III]

@NWPlayer123 ?

 

[JaapDaniels]

quick look says
isgraph.txt
but then again i'm not a coder
it reads much better

 

[palasx]

The case switch is usually faster, as you only end up putting the variable to be compared in the stack once, instead of once for each IF comparison.