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Java lang.Long.toBinaryString() method with Examples

Last Updated : 05 Dec, 2018

The java.lang.Long.toBinaryString() method returns a string representation of the long argument as an unsigned integer in base 2. It accepts an argument in Long data-type and returns the corresponding binary string.

public static String toBinaryString(long num)

Parameters : The function accepts a single mandatory parameter: 
num - This parameter specifies the number to be converted to binary string. 
It is of Long data-type.

This function returns the string representation of the unsigned Long value represented by the argument in binary (base 2). Examples:

Input : 10 
Output : 1010 

Input : 9
Output : 1001 

The program below demonstrates the working of function.

// Java program to demonstrate
// of java.lang.Long.toBinaryString() method
import java.lang.Math;

class Gfg1 {

    // driver code
    public static void main(String args[])
    {

        long l = 10;
        // returns the string representation of the unsigned long value
        // represented by the argument in binary (base 2)
        System.out.println("Binary is " + Long.toBinaryString(l));

        l = 20987752;
        System.out.println("Binary is " + Long.toBinaryString(l));
    }
}

Output:

Binary is 1010
Binary is 1010000000011111101101000

: The program below demonstrates the working function when a negative number is passed.

// Java program to demonstrate overflow
// of java.lang.Long.toBinaryString() method
import java.lang.Math;

class Gfg1 {

    // driver code
    public static void main(String args[])
    {
        // conversion of a negative number to Binary
        long l = -13;
        System.out.println("Binary is " + Long.toBinaryString(l));
    }
}

Output:

Binary is 1111111111111111111111111111111111111111111111111111111111110011

Whenever a decimal number or a string is passed as an argument, it returns an error message which says

The program below demonstrates the working function when a string number is passed.

// Java program to demonstrate overflow
// of java.lang.Long.toBinaryString() method
import java.lang.Math;

class Gfg1 {

    // driver code
    public static void main(String args[])
    {

        // error message thrown when a string is passed
        System.out.println("Binary is " + Long.toBinaryString("10"));
    }
}

Output:

prog.java:12: error: incompatible types: String cannot be converted to long
    System.out.println("Binary is " + Long.toBinaryString("10"));

The program below demonstrates the working function when a decimal is passed.

// Java program to demonstrate overflow
// of java.lang.Long.toBinaryString() method
import java.lang.Math;

class Gfg1 {

    // driver code
    public static void main(String args[])
    {

        // error message thrown when a decimal is passed
        System.out.println("Binary is " + Long.toBinaryString(10.25));
    }
}

Output:

prog.java:12: error: incompatible types: possible lossy conversion from double to long
    System.out.println("Binary is " + Long.toBinaryString(10.25));

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