# How to convert a negative number to positive in Java

How to convert a negative number to positive  will learn in this article . We can will make a negative number positive using different methods as following .

## Convert a negative number to positive by multiply -1

Now we write a java program to make a negative number to positive by multiply -1 . In this java program we will take input from user as negative number then multiply by -1 it .

``````import java.util.Scanner;

public class NegToPos1 {
public static void main(String[] args) {
int negtiveNumber;
int positiveNumber;

Scanner sc = new Scanner(System.in);
System.out.println("Enter a negtive number: ");
negtiveNumber = sc.nextInt();

if (negtiveNumber < 0) {
positiveNumber = negtiveNumber * (-1);
System.out.println("Positive number: " + positiveNumber);
}else{
}
}

}``````

Output :

``````Enter a negtive number:
-80
Positive number: 80``````

## Java program to convert a negative number  to positive By using Math.abs()

We can convert a negative int to positive by using Math.abs() method . Math.abs() method return the absolute value of the given argument.

``````import java.util.Scanner;

public class NegToPos2 {
public static void main(String[] args) {
int negtiveNumber;
int positiveNumber;

Scanner sc = new Scanner(System.in);
System.out.println("Enter a negtive number: ");
negtiveNumber = sc.nextInt();

if (negtiveNumber < 0) {
positiveNumber = Math.abs(negtiveNumber );
System.out.println("Positive number: " + positiveNumber);
}else{
}
}
}``````

Output :

``````Enter a negtive number:
-90
Positive number: 90``````

## Convert a negative number to positive By using Bitwise Complement Operator

To convert negative int to positive  we will use the Bitwise Complement Operator in this java program .

``````import java.util.Scanner;

public class NegToPos3 {
public static void main(String[] args) {
int negtiveNumber;
int positiveNumber;

Scanner sc = new Scanner(System.in);
System.out.println("Enter a negtive number: ");
negtiveNumber = sc.nextInt();

if (negtiveNumber < 0) {
positiveNumber = ~(negtiveNumber-1);
System.out.println("Positive number: " + positiveNumber);
}else{
``````Enter a negtive number: