Example: Decimal to Binary Converter in Java in Java

// Decimal to Binary Converter
import java.util.Scanner;

public class Main {

    /**
     * Converts a decimal integer to its binary string equivalent.
     * @param decimal The decimal number.
     * @return The binary string representation of the decimal number.
     */
    public static String decimalToBinary(int decimal) {
        if (decimal == 0) {
            return "0"; // Special case for 0
        }

        StringBuilder binaryBuilder = new StringBuilder(); // To efficiently build the binary string
        int tempDecimal = decimal;

        // Perform repeated division by 2
        while (tempDecimal > 0) {
            int remainder = tempDecimal % 2; // Get the remainder (0 or 1)
            binaryBuilder.append(remainder); // Append remainder to the builder
            tempDecimal /= 2; // Divide the number by 2
        }

        // The binary string is built in reverse, so reverse it before returning
        return binaryBuilder.reverse().toString();
    }

    public static void main(String[] args) {
        // Example usage
        int decimal = 13;
        String binaryResult = decimalToBinary(decimal);
        System.out.println("Decimal: " + decimal + " -> Binary: " + binaryResult); // Output: 1101
    }
}