I am writing a GPA program for my C++ class. What I am trying to do what is above, and beyond what my professor is requiring us to do. I have is so the user enters their letter grade when prompted. I want to make it so when a letter other than an A, B, C, D, or F is enter the program terminates, and tells them they entered an invalid letter grade. This is what I did for my if statement.
grade1 is a char variable where I store the inputed character grade.
if ( grade1 != 'A' || 'B' || 'C' || 'D' || 'F')
cout << "You have enter an invalid letter grade." << endl;
When running the program the if statement is true for any letter than I enter. What did I do wrong?