java.lang.Long.bitCount() is a built in function in Java that returns the number of set bits in a binary representation of a number. It accepts a single mandatory parameter
number whose number of set bits is returned.
Syntax:
public static long bitCount(long num)
Parameters:
num - the number passed
Returns:
the number of set bits in the binary representation of the number
Examples:
Input : 8
Output : 1
Explanation: Binary representation : 1000
No of set bits=1
Input : 1032
Output : 2
Explanation: binary representation = 10000001000
no of set bits = 2
The program below illustrates the java.lang.Long.bitCount() function:
Program 1:
Output:
binary representation = 10000001000
no of set bits = 2
Program 2: When a negative number is passed in the argument
Output:
binary representation = 1111111111111111111111111111111111111111111111111111101111111000
no of set bits = 60
Error: The function returns an error if any data-type other than long is passed as an argument.
Program 3: When decimal number is passed as an argument
Output:
prog.java:15: error: incompatible types: possible lossy conversion from double to long
System.out.println("no of set bits = " + Long.bitCount(11.23));
Program 4: When string number is passed as an argument
