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How do I convert a string to Upper and to Lower case in Turbo Prolog.

string_upper and string_lower function is for SWI Prolog,

I found something like,

tolower([], []).
tolower([Upper|UpperTail], [Lower|LowerTail]) :-
char_type(Lower, to_lower(Upper)),
tolower(UpperTail, LowerTail).

But didn't get what exactly it is. Can anyone help me solve this.

Hunterr
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    Did you try running the code you are showing? Does it give an error, or just unexpected results? A quick Google search also shows a [different solution](http://objectmix.com/prolog/183135-converting-string-uppercase-lowercase.html) which checks the code range of the character. – lurker Nov 01 '15 at 16:52

1 Answers1

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I did it using upper_lower(),

write("Enter string to convert\n"),
readln(Str1),


upper_lower(Str1,Low),
write("In lower case "),
write(Low),nl,
write("In Upper Case "),
upper_lower(Upp,Str1),
write(Upp).

The upper_lower Predicate: The upper_lower predicate can be used to convert uppercase characters to lowercase, or lowercase letters to uppercase. The general form of the predicate is upper_lower(UpperCaseString, LowerCaseUpperCaseString)

Hunterr
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