Re-write the following code using only if, else if and/or else statements.
switch (testscore 10) case e case 1: case 2: case 3: case 4: case 5: cout << "The grade is E." << endl; break; case 6: cout << "The grade is D." << endl; break; case 7: cout << "The grade is C." << endl; break; case 8: cout << "The grade is B" << endl; break; case 9: case 10: cout << "The grade is A." << endl; break; default: cout << "Invalid test score." << endl; break;