Chapter 7, Problem 1E

Write a program in a class NumberAboveAverage that counts the number of days that the temperature is above average. Read ten temperatures from the keyboard and place them in an array. Compute the average temperature and then count and display the number of days on which the temperature was above average.

Program Plan Intro

“NumberAboveAverage” class

Program Plan:

“NumberAboveAverage.java”:

• • Define “NumberAboveAverage” class.
  • ○ Define main function.
    • ■ Declare an array “temperature” in “double” base type.
    • ■ Create an object for scanner class.
    • ■ Display prompt statement.
    • ■ Read ten temperature from user using “for” loop.
      • • Display prompt statement for each temperature.
      • • Read temperature one by one from user.
    • ■ Initializes total temperature “total_temp” to “0.0”.
    • ■ Compute sum of all temperature using “for” loop.
      • • The sum is computed by using “total_temp += temperature[i];”
    • ■ The average temperature is computed by using “total_temp/10” and it is stored to a variable “tempAverage”.
    • ■ Display average temperature.
    • ■ Initializes the day count “dayCount” to “0”.
    • ■ Using “for” loop, compute which day has above average.
      • • If temperature is greater than average temperature, then increment the day count.
      • • Display the day which has above average temperature.
    • ■ Finally display total number of days has above temperature.

Program Description Answer

The below java program is used to counts the number of days that the temperature is above the average of temperature.

Explanation of Solution

Program:

Filename: “NumberAboveAverage.java”

//Import required package

import java.util.Scanner;

//Define "NumberAboveAverage" class

public class NumberAboveAverage

{

    //Define main function

    public static void main(String[] args)

    {

        //Declare an array for temperature

        double[] temperature = new double[10];

        //Create object for scanner class

        Scanner reader = new Scanner(System.in);

        //Display prompt statement

System.out.println("Please enter the values of ten temperature");

//Read ten temperatures from user using "for" loop

        for(int i = 0; i < 10; i++)

        {

            //Prompt statement for temperature

System.out.print("Enter temperature for Day " + i + " is: ");

            //Read temperature one by one from user

            temperature[i] = reader.nextDouble();

        }

        //Initializes total temperature to "0".

        double total_temp = 0.0;

//Compute sum of all temperature using "for" loop

        for(int i = 0; i < 10; i++)

        {

            total_temp += temperature[i];

        }

        //Compute the average temperature to "0"

        double tempAverage = total_temp/10;

        //Display average temperature

System.out.println("The average temperature is: " + tempAverage);

        //Initializes the day count to "0"

        int dayCount = 0;

//Using "for" loop, compute which day has above average

        for(int i = 0; i < 10; i++)

        {

/* If temperature is greater than average temperature, then */

            if( temperature[i] > tempAverage)

            {

                //Increment the day count

                dayCount++;

//Display the day which has above average temperature

System.out.println("Day " + i + " had temperature " + temperature[i] + " which was above average");               

            }

        }     

//Finally display total number of days has above temperature

System.out.println("The number of days with a temperature above average is: " + dayCount);

    }

}

Sample Output

Output:

Please enter the values of ten temperature

Enter temperature for Day 0 is: 10

Enter temperature for Day 1 is: 40

Enter temperature for Day 2 is: 15

Enter temperature for Day 3 is: 80

Enter temperature for Day 4 is: 42

Enter temperature for Day 5 is: 28

Enter temperature for Day 6 is: 48

Enter temperature for Day 7 is: 12

Enter temperature for Day 8 is: 30

Enter temperature for Day 9 is: 84

The average temperature is: 38.9

Day 1 had temperature 40.0 which was above average

Day 3 had temperature 80.0 which was above average

Day 4 had temperature 42.0 which was above average

Day 6 had temperature 48.0 which was above average

Day 9 had temperature 84.0 which was above average

The number of days with a temperature above average is: 5