# Java Program to Convert Binary Number to Decimal and vice-versa

## Example 1: Program to convert binary number to decimal

``````
public class BinaryDecimal{

public static void main(String[] args){
long num = 110110111;
int decimal = convertBinaryToDecimal(num);
System.out.printf("%d in binary = %d in decimal", num, decimal);
}

public static int convertBinaryToDecimal(long num){
int decimalNumber = 0, i = 0;
long remainder;
while (num != 0)
{
remainder = num % 10;
num /= 10;
decimalNumber += remainder * Math.pow(2, i);
++i;
}
return decimalNumber;
}
}``````

Output

`110110111 in binary = 439 in decimal`

## Example 2: Program to convert decimal number to binary

``````
public class DecimalBinary{

public static void main(String[] args){
int num = 19;
long binary = convertDecimalToBinary(num);
System.out.printf("%d in decimal = %d in binary", num, binary);
}

public static long convertDecimalToBinary(int n){
long binaryNumber = 0;
int remainder, i = 1, step = 1;

while (n!=0)
{
remainder = n % 2;
System.out.printf("Step %d: %d/2, Remainder = %d, Quotient = %dn", step++, n, remainder, n/2);
n /= 2;
binaryNumber += remainder * i;
i *= 10;
}
return binaryNumber;
}
}``````

Output

```Step 1: 19/2, Remainder = 1, Quotient = 9
Step 2: 9/2, Remainder = 1, Quotient = 4
Step 3: 4/2, Remainder = 0, Quotient = 2
Step 4: 2/2, Remainder = 0, Quotient = 1
Step 5: 1/2, Remainder = 1, Quotient = 0
19 in decimal = 10011 in binary```

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`Disclaimer: The information and code presented within this recipe/tutorial is only for educational and coaching purposes for beginners and developers. Anyone can practice and apply the recipe/tutorial presented here, but the reader is taking full responsibility for his/her actions. The author (content curator) of this recipe (code / program) has made every effort to ensure the accuracy of the information was correct at time of publication. The author (content curator) does not assume and hereby disclaims any liability to any party for any loss, damage, or disruption caused by errors or omissions, whether such errors or omissions result from accident, negligence, or any other cause. The information presented here could also be found in public knowledge domains.  `