Case statement problem

I'm completely new to using case statements in C++ so bear with me. I'm trying to do a very simple case statement that will display the user to the user what grade they have got.

Code:

---

#include <iostream>
using namespace std;

int main()
{

int grade;

cout << "Please enter your grade";
cin >> grade;

switch (grade)
{
case grade >= 70:
cout << endl << "You got a grade A";
break;
case grade >= 60:
cout << endl << "You got a grade B1";
break;
case grade >= 50:
cout << endl << "You got a grade B2";
break;
case grade >= 40:
cout << endl << "You got a grade C";
break;
case grade >= 30:
cout << endl << "You got a grade D";
break;
case grade == 30:
cout << endl << "You Failed";
}

return 0;

}

---

I know it is the "grade >=" ect parts that are wrong but I dont know how to right it so that it works. Anyone help?

Thanks.

Switch case statements can only contain integers or chars as case statements.

ie:

Code:

---

case 1:
// code
break;

or

case 'A':
case 'a':
// code
break;

aslo, supply a default case to catch an error

default:
  cout << "\nERROR: Invalid input!" << endl;
  break;

---

It may be easier to do this:

Code:

---

cout << "Enter your grade: ";
cin >> grade;

if ( grade >= 50 )
  cout << "\nYou got a D" << endl;

---

Yeah, it's the job for if statements, not switches.

To use a switch you need to have a single constant expression for each case. So you can't do case grade <= 10. you must do case 1: , case 2: ...

But you can change your expression grade/10 to get the tenth's place digit of grade.

Eg:

Code:

---

switch(grade/10)
{
case 9:
case 8:
cout << endl << "You got a grade A";
break;
case 6:
cout << endl << "You got a grade B1";
break;
case 5:
cout << endl << "You got a grade B2";
break;
case 4:
cout << endl << "You got a grade C";
break; 
}

---

Thnaks got it working now.