Java program to check whether a number is Positive or Negative or Zero
In this tutorial, we will discuss a concept in Java program to check whether a number is Positive or Negative or Zero
In this post, we will learn how to check if the number is positive or negative or zero in Java programming language
Logic of the program
If the number is greater than zero it is a positive number – (if the number>=0)
If the number is less than to zero it is a Negative number – (if the number<=0)
if the number is equal to zero the number is zero – (if the number==0)
Using if else if statements
Program 1
This program allows the user to enter a number and check if the number is positive or negative or zero using if else if statements
import java.util.Scanner;
class CheckPosNegZero{
public static void main(String args[]){
Scanner scan=new Scanner(System.in); //create a scanner object for input
System.out.print("Enter the number: ");
int num1=scan.nextInt();//get input from the user for num1
if(num1>0){
System.out.println(num1+" is a positive number");
}
else if(num1<0){
System.out.println(num1+" is a Negative number");
}
else{
System.out.println("number is Zero");
}
}
}
When the above code is executed, it produces the following result
case 1
Enter the number: 4 4 is a positive number
case 2
Enter the number: -6 -6 is a Negative number
case 3
Enter the number: 0 Number is zero
Using nested if statements
Program 2
This program allows the user to enter a number and check if the number is positive or negative or zero using nested if statements
import java.util.Scanner;
class CheckPosNegZero1{
public static void main(String args[]){
Scanner scan=new Scanner(System.in); //create a scanner object for input
System.out.print("Enter the number: ");
int num1=scan.nextInt();//get input from the user for num1
if(num1<=0){
if(num1==0){
System.out.println(" you entered zero");
}
else{
System.out.println(num1+" is a Negative number");
}
}
else{
System.out.println(num1+" is a positive number");
}
}
}
When the above code is executed, it produces the following result
case 1
Enter the number: 20 20 is a positive number
case 2
Enter the number: -15 -15 is a Negative number
case 3
Enter the number: 0 you entered zero
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