Student Programmer needs help help with for loop

[kmartar]

Working on a program for class and my for loop isn't working correctly. It suppose to count the calories burned every five minutes stopping at 30minutes.
It never stops.

int main()
{
   double calsPerMin = 3.9, minutes = 5;
   char again;
do
{
  cout << "Minutes        Calories Burned" << endl;
  cout << "-------------------------------" << endl;

  for ( minutes; minutes = 30; minutes*=5)
  {
	  cout << minutes << setw(5) << calsPerMin * minutes << endl;
  }
  // Asks the user if they want to try again.
	cout << "Would you like to try again? (y or n)";
	cin >> again;
	 }while (again == 'Y' || again == 'y');

  system("pause");
  return 0;
}

[mobotus]

http://www.cplusplus.com/doc/tutorial/control/

The for loop

Its format is:

for (initialization; condition; increase) statement;


Your for loops condition is minutes = 30.

and don't use doubles in a for loop you can make it int seconds if you need too