uppercase - Convert string to Upper and Lower case Turbo Prolog -

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how convert string upper , lower case in turbo prolog.

string_upper , string_lower function swi prolog,

i found like,

tolower([], []). tolower([upper|uppertail], [lower|lowertail]) :- char_type(lower, to_lower(upper)), tolower(uppertail, lowertail).

but didn't is. can me solve this.

i did using upper_lower(),

write("enter string 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: upper_lower predicate can used convert uppercase characters lowercase, or lowercase letters uppercase. general form of predicate upper_lower(uppercasestring, lowercaseuppercasestring)


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