CS 101 homework help

Need help with basic cpp. I need an explanation of this code: ================================================ switch ( menuOption) { case 1: planetWeight = earthWeight * 0.39; // Mercury break; case 2: planetWeight = earthWeight * 0.91; // Venus break; case 3: planetWeight = earthWeight * 0.38; // Mars break; default: planetWeight = earthWeight - 1; // Earthweight - 1 // People like to think they're losing weight (marketing) break; } cout << " Your new weight is " << planetWeight "\n"; // Now illustrating the continue statement int firstNumber, secondNumber; for ( ; ; ) { // Begin infinite loop cout<< "Enter two integers, where we will divide the first by the second: "; cin>> firstNumber >> secondNumber; if ( secondNumber == 0 ) { continue; // Try again, as division by 0 is problematic } cout<< firstNumber << " / " << secondNumber << " = " << firstNumber/secondNumber << "\n; } cout<< "You will never see this secret message. My locker combination is: 22-46-19."; return 0; } ===================================================== 1) firstNumber and secondNumber are ints: will the result be an int or a decimal? 2)how can I make sure it shows as decimal? 3) if I erase the break; 's from the switch, the program gives output, but doesn't work right. If I erase all the breaks will it perform the last case or the default? 4) Why does for(;;) actully loop? Is it possible to do empty loops with while too? Why use empty loops?