((a + b)^2 - (a^2 + 2ab)) / b^2using System;
namespace Task3
{
class MainClass
{
public static void Main(string[] args)
{
float a, b;
bool ok;
do
{
Console.WriteLine("Enter the number 'a', using a comma for real");
string buf = Console.ReadLine();
ok = float.TryParse(buf, out a);
if (ok == false) Console.WriteLine("Error! Entering a number, please, thry again");
} while (ok == false);
do
{
Console.WriteLine("Enter the number 'b', using a comma for real");
string buf = Console.ReadLine();
ok = float.TryParse(buf, out b);
if (ok == false) Console.WriteLine("Error! Entering a number, please, thry again");
} while (ok == false);
if (b == 0) Console.WriteLine("Error!");
else
{
float c = (float)Math.Pow(a + b, 2);
float d = (float)Math.Pow(a, 2);
float e = (float)2 * a * b;
float f = (float)Math.Pow(b, 2);
float g = (float)(c - (d + e)) / f;
Console.WriteLine($"((a + b)^2 - (a^2 + 2ab)) / b^2 = {g}, a = {a}, b = {b}");
}
}
}
}
namespace Task3
{
class MainClass
{
public static void Main(string[] args)
{
const string expression = "((a + b)² - (a² + 2ab)) / b²";
Console.WriteLine(expression);
var a = GetDouble("a");
var b = GetDouble("b");
if (b == 0)
{
Console.WriteLine("Invalid value of b");
return;
}
var result = EvaluateExpression(a, b);
Console.WriteLine(@$"a = {a};
b = {b};
{expression} = {result}");
}
private static double GetDouble(string varName)
{
Console.WriteLine($"Enter the number '{varName}', using a '.' for fractional part");
double value;
while (!double.TryParse(Console.ReadLine(), NumberStyles.Float | NumberStyles.Integer, CultureInfo.InvariantCulture, out value))
Console.WriteLine("Wrong number format, please try again");
return value;
}
private static double EvaluateExpression(double a, double b) =>
(Math.Pow(a + b, 2) - (Math.Pow(a, 2) + 2 * a * b)) / Math.Pow(b, 2);
}
}