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 1234567/Returnstrueifthecharacterisintherange0..9.eparamcthecharactertoexamine.Qreturntrueifcisadigit.///Writeyourfunctionhere 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 ..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 Returns the uppercase version of any lowercase character. aparam c the character to modify areturn the uppercase version of c if c is lowercase. If not, then c. */ // Write your function here You are given a string of any length. Return a new string consisting of the first and last characters concatenated together. You cannot use the at() member function or the subscript operator []. If the is less than length 2, return the original string. main.cpp FDR. monogram.cpp