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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
