how to make if statement in this condition

[hein harry thu]

Example: Enter a letter grade: a Grade range is 90 – 100
Enter a letter grade: B Grade range is 80 – 89 << this is my instruction

here is my code

#include <iostream>
#include <iomanip>

using namespace std;

int main()

{
char Grade, A, a, b, B;
cout<<setw(5)<< "Grade" <<setw(15) << "Range" <<setw(15) << "Grade" <<setw(15) << "Range" <<endl;
cout<<setw(5)<< "A" <<setw(15) << "90 - 100" <<setw(15) << "D" <<setw(15) << "60 - 69" << endl;
cout<<setw(5)<< "B" <<setw(15) << "80 - 89" <<setw(15) << "F" <<setw(15) << "50 - 59" << endl;
cout<<setw(5)<< "C" <<setw(15) << "70 - 79"<<setw(15)<< "" << setw(15) << "" <<endl;
cout << "Enter a letter grade: ";
cin >> Grade;
if (Grade==a && Grade==A)

{ cout << "Grade range is 90 - 100 " << endl;
}
else if (Grade==b && Grade==B)

{cout << "Grade range is 80- 89 " << endl;
}
else
{
cout << "Invalid grade" << endl;
}
return 0;
}

showing the invalid grade at output

[highwayman]

Are you trying to write your own sqrt function or are you trying to use sqrt because if it’s the second one then just include <cmath> in the file.

[Niccolo]

This clause

5 sqrt(3)

is a problem. There's no multiplication operator, and it isn't implied in C++ as it is in math.

5 * sqrt(3)

That would do it.