NXC  Version 1.2.1 r5
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This is an example of how to use the UpperCase, LowerCase, UpperCaseEx, and LowerCaseEx functions.

task main()
string test = "Lorem Ipsum Dolor Sit";
string upper = UpperCase(test);
string lower = LowerCase(test);
TextOut(0, LCD_LINE1, test);
TextOut(0, LCD_LINE2, upper);
TextOut(0, LCD_LINE3, lower);
upper = UpperCaseEx(test, 1, 10);
lower = LowerCaseEx(test, 1, 10);