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Madi
Level 6
Nice
  • 08.12.2020
  • 365views
  • 4comments

I dunno what's wrong! plz help!

Question about the task Positive and negative numbers
Java Syntax,  Level 4,  Lesson 7
Resolved


Use the keyboard to enter three integers. Display the number of positive numbers and the number of negative numbers in the original set, in the following form:
"Number of negative numbers: a" and "Number of positive numbers: b", where a and b are the unknowns.

Here are some examples:
a) if you enter the numbers
2
5
6
then we display
Number of negative numbers: 0
Number of positive numbers: 3

b) if you enter the numbers
-2
-5
6
then we display
Number of negative numbers: 2
Number of positive numbers: 1

Requirements:
  • The program should read the numbers from the keyboard.
  • The program should display text on the screen.
  • The program should display the number negative numbers in the original set.
  • The program should display the number of positive numbers in the original set.
  • If there are no negative numbers, the program should display "Number of negative numbers: 0".
  • If there are no positive numbers, the program should display "Number of positive numbers: 0".
  • Note that 0 is not a positive or negative number.
package com.codegym.task.task04.task0429; /* Positive and negative numbers */ import java.io.*; public class Solution { public static void main(String[] args) throws Exception { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); String s1 = reader.readLine(); String s2 = reader.readLine(); String s3 = reader.readLine(); int a = Integer.parseInt(s1); int b = Integer.parseInt(s2); int c = Integer.parseInt(s3); if (a > 0 && b > 0 && c > 0 ){ System.out.println("Number of negative numbers: " + 0); System.out.println("Number of positive numbers: " + 3); } else if ((a < 0 && b > 0 && c > 0) || (a > 0 && b < 0 && c > 0) || (a > 0 && b > 0 && c < 0) ){ System.out.println("Number of negative numbers: " + 1); System.out.println("Number of positive numbers: " + 2); } else if ((a < 0 && b < 0 && c > 0) || (a > 0 && b < 0 && c < 0) || (a < 0 && b > 0 && c < 0)){ System.out.println("Number of negative numbers: " + 2); System.out.println("Number of positive numbers: " + 1); } else if (a < 0 && b < 0 && c < 0 ){ System.out.println("Number of negative numbers: " + 3); System.out.println("Number of positive numbers: " + 0); } else if (a == 0){ if (b > 0 && c > 0) { System.out.println("Number of negative numbers: " + 0); System.out.println("Number of positive numbers: " + 2); } else if ((b < 0 && c > 0) || (b > 0 && c < 0)) { System.out.println("Number of negative numbers: " + 1); System.out.println("Number of positive numbers: " + 1); } else if (b < 0 && c < 0){ System.out.println("Number of negative numbers: " + 2); System.out.println("Number of positive numbers: " + 0); } } else if (b == 0){ if (a > 0 && c > 0) { System.out.println("Number of negative numbers: " + 0); System.out.println("Number of positive numbers: " + 2); } else if ((a < 0 && c > 0) || (a > 0 && c < 0)) { System.out.println("Number of negative numbers: " + 1); System.out.println("Number of positive numbers: " + 1); } else if (a < 0 && c < 0){ System.out.println("Number of negative numbers: " + 2); System.out.println("Number of positive numbers: " + 0); } } else if (c == 0){ if (b > 0 && a > 0) { System.out.println("Number of negative numbers: " + 0); System.out.println("Number of positive numbers: " + 2); } else if ((b < 0 && a > 0) || (b > 0 && a < 0)) { System.out.println("Number of negative numbers: " + 1); System.out.println("Number of positive numbers: " + 1); } else if (a < 0 && b < 0){ System.out.println("Number of negative numbers: " + 2); System.out.println("Number of positive numbers: " + 0); } } else if ((a == 0) && (b == 0)){ if (c > 0) { System.out.println("Number of negative numbers: " + 0); System.out.println("Number of positive numbers: " + 1); } else if (c < 0){ System.out.println("Number of negative numbers: " + 1); System.out.println("Number of positive numbers: " + 0); } } else if (a == 0 && c == 0){ if (b > 0) { System.out.println("Number of negative numbers: " + 0); System.out.println("Number of positive numbers: " + 1); } else if (b < 0) { System.out.println("Number of negative numbers: " + 1); System.out.println("Number of positive numbers: " + 0); } } else if (b == 0 && c == 0){ if (a > 0) { System.out.println("Number of negative numbers: " + 0); System.out.println("Number of positive numbers: " + 1); } else if (a < 0){ System.out.println("Number of negative numbers: " + 1); System.out.println("Number of positive numbers: " + 0); } } else { System.out.println("Number of negative numbers: " + 0); System.out.println("Number of positive numbers: " + 0); } } }
0
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Misiu
Level 41 , Gdansk, Poland
8 December 2020, 13:47
Oh mine... So many conditions... Try: - create two variables, one for positives, one for negatives, say: p and n - check a first number: - if number is positive increase p - if number is negative increase n - check a second number - check a third number - print result
0
Madi
Level 6 , Nice, France
8 December 2020, 16:30
thank u for ur response! Although if u might explain some more, that would be great. Like if u could give me an example. thanks!
0
Misiu
Level 41 , Gdansk, Poland
8 December 2020, 19:51solution
if (a > 0) p++; else if (a < 0) n++;
+2
Madi
Level 6 , Nice, France
9 December 2020, 16:28
Thank u !☺️
0
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