a) prompts the user to enter a letter and converts it into its equivalent numerical value;
b) prompts the user to enter a number between 33 and 254 and converts it into its corresponding character;
c) prompts the user to enter a lowercase and transforms it into its uppercase representation;
d) prompts the user to enter a number of hours and computes the number of minutes from those hours;
e) prompt the user to enter a number of minutes greater than 60 and outputs the number of hours and remaining minutes (e.g. if the user enters 78, the program will print "1 hour and 18 minutes".
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using namespace std;
cout << "Please enter in a letter: ";...