Help Please toloswer and to upper question

[Esmeralda53]

I did a simple program Passing garde and I have to be able to enter grades in lower or upper case but for some reason my code does not accepts the lowercase grades can someone help me please here is part of my code....

#include <cctype>
#include <iostream>
using namespace std;

// required for conversion to lowercase
class toLower {public: char operator()(char c) const {return tolower(c);}};
char getGrade()

{

char grade = 'Q'; // the default value
grade = tolower(grade);
while (true)

{
cout << "What is your grade? [A, B, C, D, F, or Q to quit]: ";
cin >> grade;
cin.ignore(1000, 10);
if (grade == 'A' || grade == 'B' || grade == 'C') break;
if (grade == 'D' || grade == 'F') break;
if (grade == 'Q' || grade == 'q') break;

cout << grade << " is not a valid grade. Try again..." << endl;

} // while
return grade;
} // getGrade
int main()
{
char grade;

[Laharl]

Follow the execution of your code through an iteration and see where the case is actually changed. (Hint: It's not where it should be.)