Table of Contents
Java code to check if the given number is positive or negative or 0
In this tutorial, we will discuss the Java code to check if the given number is positive or negative or 0
In this post, we are going to learn how to check whether the given number is positive or Negative or zero using 6 ways
The logic to check positive, negative or zero
- Check the condition if(num<0), then number is negative
- Check the condition if(num>0), then number is positive
- Check the condition if(num==0), then number is zero
Program to Check if the given number is positive or negative or 0
Program to check if the given number is positive or negative or 0 – standard method
Program 1
//Java program to check whether the given number positive or negative or zero
class CheckPositiveNegative0{
public static void main(String args[]){
int num=456;
if(num>0){
System.out.println(num+" is a positive number");
}else if(num<0){
System.out.println(num+" is a Negative number");
}
else{
System.out.println("The given number is zero");
}
}
}
When the above code is executed, it produces the following result
456 is a positive number
In this program,
- integer variable num is declared and initialized
- The given numbers are tested whether it is positive, negative or zero using if- else statements
- Then,the program is displayed the output using System.out.print() function.
Program to check if the given number is positive or negative or 0 – Entered by user
Program 2
import java.util.Scanner;
class CheckPositiveNegativezero{
public static void main(String args[]){
Scanner scan=new Scanner(System.in); //create a scanner object for input
System.out.print("Enter the integer number: ");
int num=scan.nextInt();//get input from the user for num
if(num>0){
System.out.println(num+" is a positive number");
}else if(num<0){
System.out.println(num+" is a Negative number");
}
else{
System.out.println("The given number is zero");
}
}
}
When the above code is executed, it produces the following result
Case 1
Enter the integer number:125 125 is a positive number
Case 2
Enter the integer number:-453 -453 is a negative number
Case 3
Enter the integer number:0 The given number is zero
Approach
- integer variable num is declared.
- The program asks input from the user
- Then the user enters the input values for num.
- The program will read the input using Scanner class and store to the variable num
- The given number is tested whether it is positive, negative or zero using if- else statements
- Then,the program is displayed the output of using System.out.print() function,
Program to check if the given number is positive or negative or 0 – using Nested if
Program 3
import java.util.Scanner;
class CheckPositiveNegativeNestedif{
public static void main(String args[]){
Scanner scan=new Scanner(System.in); //create a scanner object for input
System.out.print("Enter the integer number: ");
int num=scan.nextInt();//get input from the user for num
if(num<=0){
if(num==0){
System.out.println("you entered zero");
}else{
System.out.println(num+" is a Negative number");
}
}
else{
System.out.println(num+" is a Positive number");
}
}
}
When the above code is executed, it produces the following result
Case 1
Enter the integer number:25 25 is a positive number
Case 2
Enter the integer number:-43 -43 is a negative number
Case 3
Enter the integer number:0 you entered zero
Approach
- integer variable num is declared.
- The program asks input from the user
- Then the user enters the input values for num.
- The program will read the input using Scanner class and store to the variable num
- The given number is tested whether it is positive, negative or zero using Nested if- else statements
- Then,the program is displayed the output of using System.out.print() function,
Program to check if the given number is positive or negative or 0 – using method
Program 4
import java.util.Scanner;
class CheckPositiveNegativeMethod{
public static void main(String args[]){
Scanner scan=new Scanner(System.in); //create a scanner object for input
System.out.print("Enter the integer number: ");
int num=scan.nextInt();//get input from the user for num
PosNegZero(num);//method call
}
public static void PosNegZero(int num){//method definition
if(num>0){
System.out.println(num+" is a positive number");
}else if(num<0){
System.out.println(num+" is a Negative number");
}
else{
System.out.println("The given number is zero");
}
}
}
When the above code is executed, it produces the following result
Case 1
Enter the integer number:234 234 is a positive number
Case 2
Enter the integer number:-543 -543 is a negative number
Case 3
Enter the integer number:0 The given number is zero
Approach
- integer variable num is declared.
- The program asks input from the user
- Then the user enters the input values for num.
- The program will read the input using Scanner class and store to the variable num
- The given number is tested whether it is positive, negative or zero using user defined method
- Then,the program is displayed the output of using System.out.print() function,
Program to check if the given number is positive or negative or 0 – using ternary operator
Program 5
import java.util.Scanner;
class CheckPositiveNegativeternary{
public static void main(String args[]){
Scanner scan=new Scanner(System.in); //create a scanner object for input
System.out.print("Enter the integer number: ");
int num=scan.nextInt();//get input from the user for num1
PosNegZero(num);//method call
}
public static void PosNegZero(int num){//method definition
System.out.println((num>=0)? "\n you have entered positive number" :
"\n you have entered Negative number");
}
}
When the above code is executed, it produces the following result
Case 1
Enter the integer number:657 you have entered positive number
Case 2
Enter the integer number:-987 you have entered Negative number
Approach
- integer variable num is declared.
- The program asks input from the user
- Then the user enters the input values for num.
- The program will read the input using Scanner class and store to the variable num
- The given number is tested whether it is positive, negative or zero using ternary operator
- Then,the program is displayed the output of using System.out.print() function,
Program to check if the given number is positive or negative or 0 -using switch case
Program 6
import java.util.Scanner;
class CheckPositiveNegativeSwitch1{
public static int positive(int num){
if(num>0){
return 1;
}
else if(num<0){
return 0;
}
else{
return -1;
}
}
public static void main(String args[]){
Scanner scan=new Scanner(System.in); //create a scanner object for input
System.out.print("\nEnter the integer number: ");
int num=scan.nextInt();//get input from the user for num
int result=positive(num);
switch(result){
case 0://check num is negative
System.out.print(num+" is negative");
break;
case 1://check num is positive
System.out.print(num+" is positive");
break;
default:
System.out.print("the given number is zero");
break;
}
}
}
When the above code is executed, it produces the following result
Case 1
Enter the integer number: 567 567 is positive
Case 2
Enter the integer number: -876 -876 is negative
Case 3
Enter the integer number: 0 The given number is zero
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