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Arithmetic mean

Java Syntax, Level 5, Lesson 5

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I have tried changing the break clause to "break" and that doesn't complete either. Help!

Use the keyboard to enter numbers, and then calculate the arithmetic mean.
If the user enters -1, display the arithmetic mean of all entered numbers and end the program.
-1 should not be included in the calculation.

Here are some examples:
a) if you enter the numbers
1
2
2
4
5
-1
then we display
2.8

b) if you enter the numbers
4
3
2
1
-1
then we display
2.5

Hint: one of the solutions to this problem uses the following construct:

while (true) {
    int number = read the number;
    if (check whether the number is -1)
        break;
}

Requirements:

The program must read data from the keyboard.
The program should display data on the screen.
After entering -1, the program must correctly terminate.
If you sequentially enter the numbers 1, 2, 2, 4, 5 and -1, the program should display 2.8.
If you sequentially enter the numbers -100, 0, 100, and -1, the program should display 0.0.
If you sequentially enter the numbers 1 and -1, the program should display 1.0.
The displayed result should match the task conditions for any input data.

package com.codegym.task.task05.task0507; /* Arithmetic mean */ import java.io.*; import java.util.*; public class Solution { public static void main(String[] args) throws Exception { //write your code here // keep running code until some types exit Scanner scanner = new Scanner(System.in); int io = scanner.nextInt(); //int io; int n = 0; int total=0; while(scanner.hasNext()){ if( (Integer)scanner.hasNext() == -1 ){ scanner.close(); } total = total + io; n++; } System.out.println((double)total/(double)n); /*while (true) { String s = buffer.readLine(); if (s.equals("exit")) break; }*/ } }

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Dmitriy Bursa

Level 27 , Kyiv, Ukraine

26 July 2019, 18:22

i think, your code will not compile, becouse generate error "incompatible types: boolean cannot be converted to java.lang.Integer" in line 22. delete line 16 and try use example loop from task

while (true) {
    int number = read the number; // scanner.nextInt();
    if (check whether the number is -1) { // if (number == -1)
        break;
    } else //increment counter and add in sum

}

Jeremy Simons

Level 7 , Peterborough, Cambridgeshire, UK, United Kingdom

5 August 2019, 16:59

Thank you for the help! IN the end I resolved it as follows: package com.codegym.task.task05.task0507; /* Arithmetic mean */ import java.lang.*; import java.io.*; import java.util.*; public class Solution { public static void main(String[] args){ //write your code here // keep running code until some types exit try{ Scanner scanner = new Scanner(System.in); int io = scanner.nextInt(); int n = 0; int total=0; do{ total=total+io; n++; //System.out.println(total + " " + n + " " + io ); io=scanner.nextInt(); if(io==-1){break;} } while(scanner.hasNext()); scanner.close(); System.out.println((double)total/(double)n); }catch(Exception e){System.out.println("You have not entered ints");} } }