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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:

1. 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.

2. 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.

3. 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 floating-point 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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