Respuesta :
Answer:
//import the Scanner class
import java.util.Scanner;
public class AverageCalculator {
public static void main(String[] args) {
//Create an object of the Scanner class to allow for user's input
Scanner input = new Scanner(System.in);
//Create first prompt for the user to enter the first number
System.out.println("Please enter the first number");
//Use the Scanner object input, to receive the first number
//And store in a double variable called fnum
double fnum = input.nextDouble();
//Create second prompt for the user to enter the second number
System.out.println("Please enter the second number");
//Use the Scanner object input, to receive the second number
//And store in a double variable called snum
double snum = input.nextDouble();
//Create third prompt for the user to enter the third number
System.out.println("Please enter the third number");
//Use the Scanner object input, to receive the third number
//And store in a double variable called tnum
double tnum = input.nextDouble();
//Declare a variable of type double, called avg, to hold the average of the three numbers
double avg;
//Now find the average of the three numbers,
// and store the result of the average in the avg variable declared above
avg = (fnum + snum + tnum) / 3;
//Print out the result with explanatory text while you convert
//all numbers to 2 decimal places by using the String.format() method.
//The String.format() method takes in two arguments - the format descriptor and
//the number to be transformed.
//First argument : In this case, the format descriptor is %.2f
//Where the % sign signifies that the string (%.2f) is a format specifier.
//The .2 specifies 2 decimal places. It means, you would use .3 if you wanted the number in 3 decimal places.
//The f signifies that the number in question is a floating-point number.
//Second argument : specifies the floating-point number to be transformed.
System.out.println("The average of the numbers " + String.format("%.2f", fnum) + ", " + String.format("%.2f", snum) + ", and " + String.format("%.2f", tnum) + " is " + String.format("%.2f", avg));
} //End of main method
} // End of class declaration
Sample output:
---------------------------------------------------------------
>> Please enter the first number
30
>> Please enter the second number
100
>> Please enter the third number
21
>> The average of the numbers 30.00, 100.00, and 21.00 is 50.33
---------------------------------------------------------------
Explanation:
The code above has been written in Java and it contains comments explaining every segment of the code. Please go through the comments carefully for more understanding.
Code without comments:
import java.util.Scanner;
public class AverageCalculator {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("Please enter the first number");
double fnum = input.nextDouble();
System.out.println("Please enter the second number");
double snum = input.nextDouble();
System.out.println("Please enter the third number");
double tnum = input.nextDouble();
double avg;
avg = (fnum + snum + tnum) / 3;
System.out.println("The average of the numbers " + String.format("%.2f", fnum) + ", " + String.format("%.2f", snum) + ", and " + String.format("%.2f", tnum) + " is " + String.format("%.2f", avg));
}
}
