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Java program to extract ‘k’ bits from a given position
Extraction of k bits from the given position in a number involves converting the number into its binary representation. An example of this is given as follows −
Number = 20 Binary representation = 10100 k = 3 Position = 2 The bits extracted are 010 which represent 2.
A program that demonstrates this is given as follows.
Example
public class Example {
public static void main (String[] args) {
int number = 20, k = 3, pos = 2;
int exNum = ((1 << k) - 1) & (number >> (pos - 1));
System.out.println("Extract " + k + " bits from position " + pos + " in number " + number );
System.out.println("The extracted number is " + exNum );
}
}Output
Extract 3 bits from position 2 in number 20 The extracted number is 2
Now let us understand the above program.
First, the values of number, k and position are defined. Then the required k bits are extracted from the given position in the number. Finally, the extracted number is displayed. The code snippet that demonstrates this is given as follows −
int number = 20, k = 3, pos = 2;
int exNum = ((1 << k) - 1) & (number >> (pos - 1));
System.out.println("Extract " + k + " bits from position " + pos + " in number " + number );
System.out.println("The extracted number is " + exNum );
Updated on: 25-Jun-2020
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