Convert characters of a string to opposite case | GeeksforGeeks

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can anyone explain please, how can I convert upper case and lower case to numbers. the user can type a letter in upper case or lower case and the output would be a telephone number including the hyphen. thanks

sbdjunior
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Program for removing the given character ....and it's not case sensitive eg a=A

aquagirl
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this could be easier using bit-wise operators

ivandrofly
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actually i need this program in java programming language with brief explanation

akshaynitin