Computing maximum and minimum value of data type using bitwise operators-CodePudding

I'm starting to learn about the bitwise operators in Java, however, I don't quite catch the questions of computing maximum/minimum value of data types (short, byte, long , float) by using bitwise operators.

How do we start with that ? As I only found problems regarding about finding even/odd number, compute value between pairs.

Any suggestion will really help as I have spend tremendous hours just by understanding it but I haven't got anywhere so far. Not many topics about Bitwise Operators Manipulation sadly.

CodePudding user response：

To get the largest value, fill all the bits to 1. The smallest value is the negation of the largest value.

public class Main{
    public static void main(String[] args) {
        int value = 0;
        for(int i=0; i<31; i  ) {
           value |= 1<<i;
        }
        System.out.println(value);
        System.out.println(Integer.MAX_VALUE);
        System.out.println(~value);
        System.out.println(Integer.MIN_VALUE);
    }
}

Output

2147483647
2147483647
-2147483648
-2147483648

See https://www.vojtechruzicka.com/bit-manipulation-java-bitwise-bit-shift-operations/#:~:text=Java uses another approach, which is called two's,by given number of positions to the right.