Elementary Programming; Exercise No. 9

Write a program that calculates the energy needed to heat water from an initial temperature to a final temperature. Your program should prompt the user to enter the amount of water in kilograms and the initial
and final temperatures of the water. The formula to compute the energy is

Q = M * (finalTemperature – initialTemperature) * 4184

where M is the weight of water in kilograms, temperatures are in degrees Celsius, and energy  Q is measured in joules.

Solution:

public static void main(String[] args) {
   Scanner s = new Scanner(System.in);
   double amountOfWater, initialTemperature, finalTemperature, energy;

   System.out.print("Enter the amount of water in kilograms:");
   amountOfWater = s.nextDouble();

   System.out.print("Enter the initial temperature:");
   initialTemperature = s.nextDouble();

   System.out.print("Enter the final temperature:");
   finalTemperature = s.nextDouble();

   energy = amountOfWater * (finalTemperature - initialTemperature) * 4184;

   System.out.print("The energy needed is " + energy);
}