POPCNT(I) (Fortran 2008)

Purpose

Population count

Counts the number of set bits in a data object.

Class

Elemental function

Argument type and attributes

I
An INTENT(IN) INTEGER
IBM extension beginsThe argument can also be of type BYTE, LOGICAL, or REAL. If the type of the argument is REAL, it must not be REAL(16).IBM extension ends

Result type and attributes

Default integer

Result value

The number of bits set to 1 in the sequence of bits of I

Examples

The following table shows the functionality of the POPCNT function.
Integer Bit Representation POPCNT
0 0000 0
1 0001 1
2 0010 1
3 0011 2
4 0100 1

Related information

Data representation models