What are case sensitive letters?

Definition of case-sensitive : requiring correct input of uppercase and lowercase letters Having the Caps Lock key on accidentally can also lead to a frustrating series of “wrong password” alerts when trying to use a case-sensitive password for your office network or Internet provider.— J. D. Biersdorfer.

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Which Lang is not case sensitive?

Originally Answered: Which programming language is not case sensitive? ABAP, Ada, Fortran, and Pascal provide case insensitivity to its identifiers. There are some server-side scripting languages like PHP (generally used in web development) which provide users to create case-insensitive function name but not variables.

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