Java Array Program to find average

In this Example you will learn how to find average of temperatures using java array.

Suppose you want to examine a series of high temperatures, compute the average temperature, and count how many days were above average in temperature.

// Reads a series of high temperatures and reports the average.

import java.util.*;
public class Temperature1 {
         public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        System.out.print("How many days' temperatures? ");
        int numDays = console.nextInt();
        int sum = 0;
        for (int i = 1; i <= numDays; i++) {
        System.out.print("Day " + i + "'s high temp: ");
           int next = console.nextInt();
           sum += next;
       }
      double average = (double) sum / numDays;
        System.out.println();
      System.out.println("Average = " + average);
      }
 }

OUTPUT

This program does a pretty good job. Here is a sample execution:

How many days' temperatures? 5
Day 1's high temp: 78
Day 2's high temp: 81
Day 3's high temp: 75
Day 4's high temp: 79
Day 5's high temp: 71

Average = 76.8

But how do you count how many days were above average?

This can be done using Looping Concepts ,Let have a look how the loop look like,

int above = 0;
for (int i = 0; i < temps.length; i++) {
if (temps[i] > average) {
above++;
}
}

You are seen in above example .we are using looping with comparison to find the how many days were above average.

Now Let’s have an look on complete program.

Example: Reads a series of high temperatures and reports the average using Java array

// Reads a series of high temperatures and reports the average.

import java.util.*;
public class Temperature1 {
         public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        System.out.print("How many days' temperatures? ");
        int numDays = console.nextInt();
       int[] temps = new int[numDays];
       
        // record temperatures and find average
        int sum = 0;
        for (int i = 1; i <= numDays; i++) {
        System.out.print("Day " + i + "'s high temp: ");
           int next = console.nextInt();
           sum += next;
       }
    
         double average = (double) sum / numDays;
      // count days above average
          int above = 0;
         for (int i = 0; i < temps.length; i++) {
                 if (temps[i] > average) {
                              above++;
                   }
      }
        System.out.println();
        System.out.println("Average = " + average);
        System.out.println(above + " days above average");

      }
 }

OUTPUT

Here is a sample execution:

How many days' temperatures? 9
Day 1's high temp: 75
Day 2's high temp: 78
Day 3's high temp: 85
Day 4's high temp: 71
Day 5's high temp: 69
Day 6's high temp: 82
Day 7's high temp: 74
Day 8's high temp: 80
Day 9's high temp: 87
Average = 77.88888888888889
5 days above average