My Sol for C#

public static void plusMinus(List arr) { int len = arr.Count; int positiveCount =0; int negativeCount=0; int zeroCount=0;

    foreach(var i in arr)
    {
        if(i>0){
            positiveCount++;
        }
        else if(i<0){
            negativeCount++;
        }
        else if(i==0){
            zeroCount++;
        }
    }

    Console.WriteLine(calcRatio(positiveCount,len).ToString("F6"));
    Console.WriteLine(calcRatio(negativeCount,len).ToString("F6"));
    Console.WriteLine(calcRatio(zeroCount,len).ToString("F6"));
}

public static double calcRatio(int integerCount,int lenArr){

    double ratio = (double) integerCount/lenArr;
    return ratio;
}

    double ratio = (double) integerCount/lenArr;
    return ratio;
}

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My Swift solution

func plusMinus(arr: [Int]) -> Void {
    let arrCount = Double(arr.count)
    let positiveArrayRatio = Double(arr.count(where: { $0 > 0})) / arrCount
    let negativeArrayRatio = Double(arr.count(where: { $0 < 0})) / arrCount
    let zeroArrayRatio = Double(arr.count(where: { $0 == 0})) / arrCount

    print(String(format: "%.6f", positiveArrayRatio))
    print(String(format: "%.6f", negativeArrayRatio))
    print(String(format: "%.6f", zeroArrayRatio))
}