Plus Minus

Problem

Given an array of integers, calculate the ratios of its elements that are positive, negative, and zero. Print the decimal value of each fraction on a new line with places after the decimal.

Note: This challenge introduces precision problems. The test cases are scaled to six decimal places, though answers with absolute error of up to $10^{-4}$ are acceptable.

Example arr = [1, 1, 0, -1, -1]

There are $n = 5$ elements, two positive, two negative and one zero. Their ratios are $\frac{2}{5} = 0.400000$, $\frac{2}{5} = 0.400000$ and $\frac{1}{5} = 0.200000$. Results are printed as:

0.400000
0.400000
0.200000

Solution

static void plusMinus(List<int> arr)
{
    float positif = 0, negatif = 0, zero = 0;
    for (int i = 0; i < arr.Count; i++)
    {
        if (arr[i] == 0) zero++;
        else if (arr[i] > 0) positif++;
        else if (arr[i] < 0) negatif++;
    }
    Console.WriteLine(Math.Round(positif/arr.Count, 6));
    Console.WriteLine(Math.Round(negatif/arr.Count, 6));
    Console.WriteLine(Math.Round(zero/arr.Count, 6));
}

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