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Java Math Exercises: Calculate and print average of the stream of given numbers

Java Math Exercises: Exercise-17 with Solution

Write a Java program to calculate and print average (or mean) of the stream of given numbers.

Sample Solution:

Java Code:

import java.util.*;
class solution {   
    // Prints average of a stream of numbers 
    static void streamAvg(float arr[]) 
    { 
        int n = arr.length; 
		float avg = 0; 
        for (int i = 0; i < n; i++)  
        { 
            //avg = getAvg(avg, arr[i], i); 
			avg = (avg * i + arr[i]) / (i + 1);
            System.out.printf("Average of %d numbers is %f \n", 
                                                   i + 1, avg); 
        } 
        return; 
    } 
  
    // Calculate the new average
    static float getAvg(float prev_avg, float x, int n) 
     { 
        return (prev_avg * n + x) / (n + 1); 
     }
  
    public static void main(String[] args) 
     { 
        float arr[] = {10, 20, 30, 40, 50, 60, 70, 80, 90, 100}; 
        streamAvg(arr); 
     } 
}

Sample 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

Flowchart:

Flowchart: Calculate and print average of the stream of given numbers.

Java Code Editor:

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Next: Write a Java program to count the numbers without digit 7, from 1 to a given number.

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