CODEWITHSUNDEEP
prologswi-prolog
Adel
Adel

Reputation: 11

prolog : How to check if the first character is uppercase

I would like to know how to check if the first character of string is a uppercase in prolog .

Upvotes: 1

Views: 475

Answers (1)

CapelliC
CapelliC

Reputation: 60034

code_type/2, char_type/2 are your friends:

?- String='Hello world',get_string_code(1,String,First),code_type(First,upper).
String = 'Hello world',
First = 72.

?- String="Hello world",get_string_code(1,String,First),code_type(First,upper).
String = "Hello world",
First = 72.

?- String=`Hello world`,get_string_code(1,String,First),code_type(First,upper).
String = [72, 101, 108, 108, 111, 32, 119, 111, 114|...],
First = 72.

These 3 examples show different kinds of strings, and be aware last one is available only starting from SWI-Prolog v.7, where it replaces double quoted literals, that were, historically, lists of codes.

Upvotes: 2

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