count_ones
count_ones(x::Integer) > Integer
Number of ones in the binary representation of x
.
julia> count_ones(7)
3
Examples
In the Julia programming language, the function count_ones(x::Integer)
Return the number of ones in the binary representation of x
.
julia> count_ones(7)
3
Here are some common examples of its use:

Count ones in a positive integer:
julia> count_ones(10) 2
This example counts the number of ones in the binary representation of the number 10.

Count ones in a negative integer:
julia> count_ones(5) 31
The function also works for negative integers. In this example, it counts the number of ones in the binary representation of 5.
 Count ones in zero:
julia> count_ones(0) 0
When the input is zero, the function correctly returns zero since there are no ones in the binary representation.
Common mistake example:
julia> count_ones(3.14)
ERROR: MethodError: no method matching count_ones(::Float64)
In this example, the input provided is a floatingpoint number (Float64
), which is not a valid argument for count_ones
. The function expects an integer argument. Make sure to provide the correct data type when using count_ones
.
See Also
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