Check if a Number is Positive or Negative in Java

September 27, 2022

Check if a Given Number is Positive or Negative in Java

Given an integer num input the objective is to write a code to Check if a Given Number is Positive or Negative in Java Language.

Example
Input : num = 11
Output : Positive

Check if a Number is Positive or Negative in Java

In this article, we will create a java program to check whether the number entered by the user is positive or negative. The number is demonstrated as positive or negative by comparing the entered number with the Zero(0). If the number entered by the user is greater than zero, then the number is positive, else if the number is less than zero, then the number is negative and else the number is zero.

N > 0 then, number is Positive.
N < 0 then, number is Negative.
N = 0 then, number is Zero.

To solve the above problem we write a Java code using three different methods.

Method 1: Using Brute Force
Method 2: Using Nested if-else Statements
Method 3: Using Ternary Operators

The Above methods are discussed in depth in the sections below.

Even or Odd number

Sum of First N Natural numbers

Sum of N natural numbers

Sum of numbers in a given range

Prime number within a given range

Method 1: Using Brute Force

This method uses Brute Force to check whether a given integer is Positive or Negative.

Java Code

Run

//Brute force
class Main
{
  public static void main (String[]args)
  {

    int num = 5;

    //Conditions to check if the number is negative or positive
    if (num > 0)
        System.out.println ("The number is positive");
    else if (num < 0)
        System.out.println ("The number is negative");
    else
        System.out.println ("Zero");
  }
}

Output

The number is positive

Algorithm

This method uses Brute Force to check whether a given integer is Positive or Negative. The Algorithm for the above code is as follows

Step 1. Start
Step 2. Insert the number.
Step 3. If the number is greater than Zero then print “The number is Positive”
Step 4: If the number is smaller than zero, then print, “The number is Negative”
Step 5. Else print, “The number is Zero”
Step 6. Stop

Method 2: Using Nested if-else Statements

This method uses a nested if-else Statements to check whether a given number is Positive or Negative.

Java Code

Run

//Using Nested If-else statement
class Main
{
  public static void main (String[]args)
  {

    int num = 5;
    
     //Condition to check if the number is negative or positive
    if (num >= 0)
    {
        if (num == 0)
            System.out.println ("Zero");
        else
            System.out.println ("The number is positive");
    }
    else
        System.out.println ("The number is negative");

  }
}

Output

The number is positive

Algorithm

This method uses a nested if-else Statements to check whether a given number is Positive or Negative.

Step 1 – Start
Step 2 – Insert the number.
Step 3 – If the number is greater or equal move to the inner nested loop
- Step 3.1 – If the number is zero, print Zero
- Step 3.2 – Else print The Number is Positive
Step 4 – Else the number has to be negative, Print The number is Negative
Step 5 – Stop

Method 3: Using Ternary Operator

This method uses a ternary operator to check whether a number is Positive or Negative.

Ternary Operator Syntax ( Condition ) ? ( if True : Action) : ( if False : Action) ;

Java code

Run

//Using Ternary Operator
class Main
{
  public static void main (String[]args)
  {

    int num = 0;

    //Condition to check if the number is negative or positive

    if (num == 0)
      {
	    System.out.println ("Zero");
      }
      
    else{
        String result = num > 0 ? "The number is positive" : "The number is negative";
        System.out.println (result);
    }
  }
}

Output

Zero

Algorithm

This method uses a ternary operator to check whether a number is Positive or Negative. The Algorithm for the above code is as follows,

Step 1 – Start
Step 2 – Insert the number.
Step 3 – If number is equal to zero, Print Number is Zero
Step 4 – Else do following – (num > 0) ? cout << “Positive”: cout << “Negative”;
Step 5 – Stop

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ASCII Table
Positive or Negative number: C | C++ | Java | Python
Even or Odd number: C | C++ | Java | Python
Sum of First N Natural numbers: C | C++ | Java | Python
Sum of N natural numbers: C | C++ | Java | Python
Sum of numbers in a given range: C | C++ | Java | Python
Greatest of two numbers: C | C++ | Java | Python
Greatest of the Three numbers: C | C++ | Java | Python
Leap year or not: C | C++ | Java | Python
Prime number: C | C++ | Java | Python
Prime number within a given range: C | C++ | Java | Python
Sum of digits of a number: C | C++ | Java | Python
Reverse of a number : C | C++ | Java | Python
Palindrome number: C | C++ | Java | Python
Armstrong number : C | C++ | Java | Python
Armstrong number in a given range : C | C++ | Java | Python
Fibonacci Series upto nth term : C | C++ | Java | Python
Find the Nth Term of the Fibonacci Series : C | C++ | Java | Python
Factorial of a number : C | C++ | Java | Python
Power of a number : C | C++ | Java | Python
Factor of a number : C | C++ | Java | Python
Finding Prime Factors of a number : C | C++ | Java | Python
Strong number : C | C++ | Java | Python
Perfect number : C | C++ | Java | Python
Perfect Square : C | C++ | Java | Python
Automorphic number : C | C++ | Java | Python
Harshad number : C | C++ | Java | Python
Abundant number : C| C++ | Java | Python
Friendly pair : C | C++ | Java | Python