Java Program to Convert int into double

May 26, 2023

What is int in Java ?

“int” is a primitive data type in Java that is used to represent integers (whole numbers) within a certain range of values. The range of values that can be stored by an “int” is from -2^31 to 2^31-1. The “int” data type is commonly used in mathematical operations and to represent arrays of integers.

What is char in Java ?

“double” is a primitive data type in Java used to represent a floating-point number (a number with a decimal point) with double precision, which means that it can store a wider range of values with more accuracy than a float. The double data type takes up 8 bytes of memory and has a range of values from approximately 4.9 x 10^-324 to 1.8 x 10^308. In Java, double values are written with a decimal point, such as “1.23” or “0.0”.

Ways to Convert int into double :

1.Use a typecast operator: The simplest way to convert an int to a double is to use a typecast operator. You can cast an int to a double by putting the int value inside a set of parentheses and placing the keyword "double" before it, like this: double x = (double) myInt;

2. Use the Double.valueOf() method: You can also use the static method "Double.valueOf()" to convert an int to a double. The method takes an int as an argument and returns a Double object, which can be implicitly converted to a double value, like this: double x = Double.valueOf(myInt).doubleValue();

3. Use the int to double arithmetic: Finally, you can use simple arithmetic to convert an int to a double by adding 0.0 to the int, like this: double x = myInt + 0.0;

Note : When converting from int to double, keep in mind that you may lose some precision, as the int value is rounded to the nearest representable double value.

Example 1 :

Run

public class Main {
    public static void main(String[] args) {
        int myInt = 42;
        double myDouble;
        
        // Typecast operator
        myDouble = (double) myInt;
        
        System.out.println("int value: " + myInt);
        System.out.println("double value: " + myDouble);
    }
}

Output :

int value: 42
double value: 42.0

Explanation : In this example the int variable "myInt" is defined and assigned the value 42. The double variable "myDouble" is declared. The int value "myInt" is cast to a double using the typecast operator (double). The values of both the int and double variables are printed to the console using the "println" method, showing that the int value was successfully converted to a double value, with no loss of precision.

Example 2 :

Run

public class Main {
    public static void main(String[] args) {
        int myInt = 42;
        double myDouble;
        
        // Double.valueOf() method
        myDouble = Double.valueOf(myInt).doubleValue();
        
        System.out.println("int value: " + myInt);
        System.out.println("double value: " + myDouble);
    }
}

Output :

int value: 42
double value: 42.0

Explanation : The int variable "myInt" is defined and given the value 42 in this example. "myDouble," a double variable, is declared. The int value "myInt" is implicitly converted to a double using the "Double.valueOf()" method, which returns a Double object, which is then implicitly converted to a double using the "doubleValue()" method. Using the "println" method, the values of both the int and double variables are printed to the console, demonstrating that the int value was successfully converted to a double value with no loss of precision.

Example :

Run

public class Main {
    public static void main(String[] args) {
        int myInt = 42;
        double myDouble;
        
        // Arithmetic
        myDouble = myInt + 0.0;
        
        System.out.println("int value: " + myInt);
        System.out.println("double value: " + myDouble);
    }
}

Output :

int value: 42
double value: 42.0

Explanation : The int variable "myInt" is defined and given the value 42 in this example. The variable "myDouble" has been declared. By adding 0.0 to the int value "myInt," it is converted to a double using simple arithmetic. Using the "println" method, the values of both the int and double variables are printed to the console, demonstrating that the int value was successfully converted to a double value with no loss of precision.

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Java Program to Convert int into double

What is int in Java ?

What is char in Java ?

Ways to Convert int into double :

Example 1 :

Output :

Example 2 :

Output :

Example :

Output :

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