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SOLVED: Please write a program that accepts hexadecimal strings containing exactly four hexadecimal digits. Hexadecimal digits are 0..9 and A,B,C,D,E,F -16 in total.The input is not case sensitive,so,e.g.ABCD,aBCd,and abcd are all valid.)
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Convert.FromHexString] The input is not a valid hex string as it contains a non-hex character. · Issue #79649 · dotnet/runtime · GitHub
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