Question

Below is a list of things that your program should do and the exact order in which they should be done:

1. Declare two integers (call them firstNumber and secondNumber) and assign them some values of your choice (1 pt).
2. Compute the result of dividing firstNumber by secondNumber; store it in an int variable. Display the result (2 pts).
3. Compute the result of dividing firstNumber by secondNumber; store it in a double variable. Display the result (2 pts).
4. Compute the result of casting firstNumber to a double, then dividing by secondNumber; store it in a double variable. Display the result (2 pts).
5. Compute the result of dividing firstNumber by secondNumber and then casting to a double (use parentheses to force the order of operations); store it in a double variable. Display the result (2 pts).
6. Explain the results that you observed in steps 2-5. Why did some of the answers give the correct mathematical result, and others did not? Write your explanation in the comments of the program. (2 pts).

Answer 1

public class Division {
   public static void main(String[] args) {
//       Declare two integers (call them firstNumber and secondNumber) and assign them some values
       int firstNumber = 8 ;
       int secondNumber = 3 ;
      
//       Compute the result of dividing firstNumber by secondNumber; store it in an int variable. Display the result
       int result1 = firstNumber/secondNumber;
       System.out.println(result1);
       /*Explanation
       * first it will calculate firstNumber/secondNumber which will give quotient only 8/3 = 2 because
       * quotient for 8/3 is 2
       */
      
//       Compute the result of dividing firstNumber by secondNumber; store it in a double variable. Display the result
       double result2 = firstNumber/secondNumber;
       System.out.println(result2);
      
       /*Explanation
       * first it will calculate firstNumber/secondNumber which will give quotient only 8/3 = 2 because
       * quotient for 8/3 is 2 and you are assigning this variable to double variable so it will become 2.0
       */
      
//       Compute the result of casting firstNumber to a double, then dividing by secondNumber; store it in a double variable. Display the result
       double result3 = ((double)firstNumber)/secondNumber;
       System.out.println(result3);
       /*Explanation
       * the cast operator has precedence over division
       * the value of firstNumber is first converted to type double and finally it gets divided by secondNumber yielding a double value.
       * if you cast any one of the variable which doing division it will give you the correct result
       * so it is giving correct result assigning it to double variable
       */
      
//       Compute the result of dividing firstNumber by secondNumber and then casting to a double (use parentheses to force the order of operations); store it in a double variable. Display the result
       double result4 = (double)(firstNumber/secondNumber);
       System.out.println(result3);
       /*Explanation
       * the cast operator has precedence over division
       * the value of firstNumber is first converted to type double and finally it gets divided by secondNumber yielding a double value.
       * if you cast any one of the variable which doing division it will give you the correct result
       * so it is giving correct result assigning it to double variable
       */
      
      
   }
}