In the previous article we have discussed about Java Program to Calculate Power of a Number
In this program we are going to see how to calculate and print average of the stream of given numbers by using Java Programming language.
Java Program to Calculate and Print Average of the Stream of Given Numbers
Before jumping into the program, let’s know the formula to find average of given numbers.
Average= (sum of all item’s values) / (Total number of items)
Example:
Suppose a=20, B=30, Then Average=(sum of value a and b)/2 = (20+30)/2 = 25
Now let’s see different ways to calculate and print average of the stream of given numbers.
Method-1: Java Program to Calculate and Print Average of the Stream of Given Numbers By Using Static Input Value
Approach:
- Declare an array ‘
arr‘ of float type and assign value to it. - Declare another integer variable ‘
n‘ to store the length of the array. - Declare a float variable ‘
avg‘ to store the result. - By using for loop print the required result continuously.
- Use the formula inside for loop to calculate the result
- Print the result.
Program:
class Main
{
public static void main(String[] args)
{
//Declare an array arr of float type and assign array elements to it.
float arr[] = {10, 20, 30, 40, 50, 60, 70, 80, 90, 100};
//declare another integer variable n to store the length of the array
int n = arr.length;
//Declare a float variable avg to store the result.
float avg = 0;
//performing for loop to print the required result continuously
for (int i = 0; i < n; i++)
{
//use the formula to calculate the result
avg = (avg * i + arr[i]) / (i + 1);
//print the result
System.out.printf("Average of %d numbers is %f \n",i + 1, avg);
}
}
}
Output: Average of 1 numbers is 10.000000 Average of 2 numbers is 15.000000 Average of 3 numbers is 20.000000 Average of 4 numbers is 25.000000 Average of 5 numbers is 30.000000 Average of 6 numbers is 35.000000 Average of 7 numbers is 40.000000 Average of 8 numbers is 45.000000 Average of 9 numbers is 50.000000 Average of 10 numbers is 55.000000
Method-2: Java Program to Calculate and Print Average of the Stream of Given Numbers By Using User Input Value
Approach:
- Declare another integer variable ‘
n‘ to store the length of the array. - Declare an array
arrof float type with an array-size ofn - By using a for loop take input of the elements for array.
- Declare a float variable ‘
avg‘ to store the result. - By using for loop print the required result continuously.
- Use the formula inside for loop to calculate the result
- Print the result.
Program:
import java.util.Scanner;
class Main
{
public static void main(String[] args)
{
//create the object of the scanner class
Scanner sc=new Scanner(System.in);
System.out.print("Enter the number of element of array: ");
//declare an integer variable n to store the length of the array
int n = sc.nextInt();
//declare an array arr of float type with an array-size of n
float arr[]= new float[n];
System.out.println("Enter the elements of array: ");
//performing a for loop to continuously take the element for array
for(int i=0;i<n;i++)
{
arr[i]=sc.nextFloat();
}
//Declare a float variable avg to store the result.
float avg = 0;
//performing for loop to print the required result continuosly
for (int i = 0; i < n; i++)
{
//use the formula to calculate the result
avg = (avg * i + arr[i]) / (i + 1);
//print the result
System.out.printf("Average of %d numbers is %f \n",i + 1, avg);
}
}
}
Output: Enter the number of element of array: 3 Enter the elements of array: 12 23 34 Average of 1 numbers is 12.000000 Average of 2 numbers is 17.500000 Average of 3 numbers is 23.000000
Method-3: Java Program to Calculate and Print Average of the Stream of Given Numbers By Using User Defined Method
Approach:
- Declare another integer variable ‘
n‘ to store the length of the array. - Declare an array
arrof float type with an array-size ofn - By using a for loop take input of the elements for array.
- Then call a user defined method say
computeValue()and passarr[]as parameter. - Then inside method by using the formula compute
avg - Print the result.
Program:
import java.util.Scanner;
class Main
{
public static void main(String[] args)
{
//create the object of the scanner class
Scanner sc=new Scanner(System.in);
System.out.print("Enter the number of element of array: ");
//declare an integer variable n to store the length of the array
int n = sc.nextInt();
//declare an array arr of float type with an array-size of n
float arr[]= new float[n];
System.out.println("Enter the elements of array: ");
//performing a for loop to continuously take the element for array
for(int i = 0; i < arr.length; i++)
{
arr[i]=sc.nextFloat();
}
//call the funtion
computeValue(arr);
}
//define the method
public static void computeValue(float arr[])
{
//Declare a float variable avg to store the result.
float avg = 0;
//performing for loop to print the required result continuosly
for (int i = 0; i < arr.length; i++)
{
//use the formula to calculate the result
avg = (avg * i + arr[i]) / (i + 1);
//print the result
System.out.printf("Average of %d numbers is %f \n",i + 1, avg);
}
}
}
Output: Enter the number of element of array: 5 Enter the elements of array: 10 39 45 67 32 Average of 1 numbers is 10.000000 Average of 2 numbers is 24.500000 Average of 3 numbers is 31.333334 Average of 4 numbers is 40.250000 Average of 5 numbers is 38.599998
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