Java program to calculate average using array

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In this program, you will learn to calculate the average of a given array in Java.

Example: Program to calculate average using an array

public class Average {
　　　　public static void main(String[] args) {
　　　　　　　　double[] numArray = {　45.3,　67.5,　-45.6,　20.34,　33.0,　45.6　};
　　　　　　　　double sum = 0.0;
　　　　　　　　for (double num: numArray) {
　　　　　　　　　　　sum　+= num;
　　　　　　　　}
　　　　　　　　double average = sum　/　numArray.length;
　　　　　　　　System.out.format("The average is: %.2f", average);
　　　　}
}

When running the program, the output is:

The average is:　27.69

In the above program, numArray stores the floating-point values required for the average.

Then, to calculate average, we need to first calculate the sum of all elements in the array. This is done using Java's for-completed by each loop.

Finally, we calculate the average using the following formula:

average = total sum of numbers　/　Total number of array elements (numArray.length)

In this case, the total number of elements is given by numArray.length.

Finally, we use the format() function to print the average so that we can use "%.2f"

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