CODEWITHSUNDEEP
javaandroid
blackJack
blackJack

Reputation: 380

Merge two bytes to int

I have two bytes, byte b1, byte b2.

b1 decimal value is 44.

b2 decimal value is 1.

I would like to join the bytes together (but not sum), to create a number like 441.

How do I achieve that?

Upvotes: 1

Views: 1109

Answers (3)

Maxim
Maxim

Reputation: 1254

Mathematical approach

double digitCount = Math.floor(Math.log10(b2) + 1.0);
int result = b1 * (int) Math.pow(10, digitCount) + b2;

Iterative approach (slice one digit at a time from right to left)

int result = 0;
int digit, multiplier = 1;
int base = b2;
while (base > 0) {
    digit = base % 10;
    base /= 10;
    result += digit * multiplier;
    multiplier *= 10;
}

base = b1;
while (base > 0) {
    digit = base % 10;
    base /= 10;
    result += digit * multiplier;
    multiplier *= 10;
}

Straightforward approach (concatenate as strings and parse)

int result = Integer.parseInt("" + b1 + b2);

Upvotes: 4

Gábor Gévay
Gábor Gévay

Reputation: 121

You could convert them to strings, then concatenate the strings, and then parse it to an int:

Integer.parseInt(Byte.toString(b1) + Byte.toString(b2))

Upvotes: 2

Jian Astrero
Jian Astrero

Reputation: 742

Kotlin:

val b1: Byte = 44.toByte()
val b2: Byte = 1.toByte()
print("$b1$b2")

Java

byte b1 = (byte)44;
byte b2 = (byte)1;
System.out.print(b1+""+b2);

Upvotes: 0

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