C++ please!!!

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The header file contains several classification functions. Assume that you don't have access to this header file. Write your own version of isdigit which returns true if a character is one of the digit characters in the range 0..9. main.cpp Error: /usr/bin/ld:/tmp/ccJ4FL7F.0: in function 'std: operator|=(std::_Ios_Fmtflags\&, std:: Ios_Fmtflags)': collect2: error: ld returned 1 exit status Score The conversion macro toupper() returns an uppercase version of a lowercase character. If the argument is not a lowercase character, the original character is returned unchanged. Write your own version of toupper() without using the > header file. Hint: The lowercase characters are all contiguous. Similarly, the uppercase characters are contiguous. The two ranges, however, are not contiguous. . .1 uppercase ..1 lowercase .. . If you can figure out the distance between a lowercase 'a' and an uppercase 'A', then you can create the converted result. main.cpp Calling with Arguments Error: /usr/bin/ld: /tmp/ccPnE4z6.0: in function 'main': collect2: error: ld returned 1 exit status Score 0