C++ Arithmetic Operator Add parentheses to change the operator precedence

#include <iostream>
using namespace std;
int main()//  ww  w .  j a v a2s  .  com
{
   float avg, grade1, grade2, grade3;
   grade1 = 87.5;
   grade2 = 92.4;
   grade3 = 79.6;
   avg = (grade1 + grade2 + grade3) / 3.0;
   cout << "The average is " << avg << "\n";
   return 0;
}