We want to find the average of three positive numbers (doubles). Consider the fo

Question

We want to find the average of three positive numbers (doubles). Consider the following class (which is not complete): // Program finds the minimum of 3 positive numbers import java.util.Scanner; public class Lab5 { // find the minimum of three numbers public static void main(String[ ] args) Scanner input - new Scanner (System.in); double one; // first number double two; // second number double three; // third number System.out.printf("%s " , "Enter a positive number or type Q to terminate" while (true) one - getInput (input): // Write code to get the remaining inputs and // if a negative value is entered. // Write code to display the minimum of the three // floating-point numbers * } // end whilee l // end main // the minimum method determines the smallest of three numbers // complete the header for the minimum method // that takes three double parameters and returns a double public static minimum () // Add code to compute and return the minimum of three numbers ) // end method minimum // the getInput method prompts the user for input and // returns a number entered by the user or -1 if a negative number // or if something else is entered. public static double getInput (Scanner input) // Add code to prompt and return the user's input } // end method getInput 1. Complete the getInput method to prompt the user and return the user's input or a -1 if he enters something other than a number 2. Add the appropriate code in the while loop to input the remainder of the input data using the getInput method or exiting the program whenever a negative value is returned. 3. Complete the header of the three parameter minimum method shown above Write the code that returns the smallest value and outputs that value 4.

Explanation / Answer

import java.util.Scanner;

class Lab5
{
public static void main (String[] args)
{
Scanner input = new Scanner(System.in);
double one;
double two;
double three;
System.out.printf("%s ","Enter a positive number or type -1 to terminate ");

while(true)
{
  one = getInput(input);
  if(one == -1)
  break;
  two = getInput(input);
  if(two == -1)
  break;
  three = getInput(input);
  if(three == -1)
  break;
  
  System.out.println("Minimum of three numbers : "+minimum(one,two,three));
}
}

public static double minimum(double one,double two,double three)
{
  
  double min = (one<two?(one<three?one:three):(two<three?two:three));//conditional operator
  return min;
}

public static double getInput(Scanner input)
{
  double x = input.nextDouble();
  if(x <0)
  return -1.0;
  else
  return x;
}
}

Output:

Enter a positive number or type -1 to terminate

14.5
12.9
4.7
-1

Minimum of three numbers : 4.7

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