Write ac program to check whether a number is positive negative or zero using switch case

Q: How do you check whether a number is positive or negative or zero?

Negative numbers are always written with a − sign in front of them and they are counted down from zero, i.e. -1, -2, -3, -4 etc. Always look at the sign in front of a number to check if it is positive or negative. Zero, 0, is neither positive nor negative.

Q: How do you check an integer is positive or negative?

If the Integer is greater than zero then it is a positive integer. If the number is less than zero then it is a negative integer. If the number is equal to zero then it is neither negative nor positive.

Java code 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
  - Program to check if the given number is positive or negative or 0 – standard method
  - Program to check if the given number is positive or negative or 0 – Entered by user
  - Program to check if the given number is positive or negative or 0 – using Nested if
  - Program to check if the given number is positive or negative or 0 – using method
  - Program to check if the given number is positive or negative or 0 – using ternary operator
  - Program to check if the given number is positive or negative or 0 -using switch case

Inhaltsverzeichnis Show

Program to Check if the given number is positive or negative or 0
How do you know if a switch case is positive negative or zero?
How do you check whether a number is positive or negative or zero?
How do you check an integer is positive or negative?

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 CheckPositiveNegativeSwitch2{
  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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Nested if in Java

Method in Java

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Operator in Java

Data type and variables in Java

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How do you know if a switch case is positive negative or zero?

How to check positive negative or zero using switch case.

(num > 0) return 1 ( true ) for positive number, otherwise 0 ( false )..

(num < 0) check negative and return 1 for negative number, otherwise 0..

(num == 0) return 1 for zero, otherwise 0..

How do you check whether a number is positive or negative or zero?

Negative numbers are always written with a '−' sign in front of them and they are counted down from zero, i.e. -1, -2, -3, -4 etc. Always look at the sign in front of a number to check if it is positive or negative. Zero, 0, is neither positive nor negative.

How do you check an integer is positive or negative?

If the Integer is greater than zero then it is a positive integer. If the number is less than zero then it is a negative integer. If the number is equal to zero then it is neither negative nor positive.