public double MakeCalculation() { for (int i = 0; i < (numberSave.Count - 1); i++) { if (temptotal == 0) { x = numberSave[i]; } else { x = temptotal; } var f = numberSave[i + 1]; if (Operator[y] == "/") { r = Divide.divided(x, f); } else if (Operator[y] == "*") { r = Multiply.multiply(x, f); } else if (Operator[y] == "+") { r = Add.add(x, f); } else if (Operator[y] == "-") { r = Subtract.subtract(x, f); } y++; temptotal = r; } numberSave.Clear(); Operator.Clear(); y = 0; temptotal = 0; return(r); }