public static void Main()
{
while (true)
{
Console.WriteLine("\nInterest Calculators");
Console.WriteLine("1. Simple interest");
Console.WriteLine("2. Compound Interest");
Console.WriteLine("3. Quit");
var option = OnlyMathLib.RequireValidDecimal("\nOption: ");
switch (option)
{
case 1:
CalculateSimpleInterest();
break;
case 2:
CalculateCompoundInterest();
break;
case 3:
Environment.Exit(0);
break;
default:
continue;
}
}
}
private static void CalculateSimpleInterest()
{
Console.WriteLine();
var principal = OnlyMathLib.RequireValidDecimal("Principal Amount: ");
var rate = OnlyMathLib.RequireValidDecimal("Interest rate: ");
var years = OnlyMathLib.RequireValidDecimal("Years: ");
var interest = SimpleInterest(principal, rate / 100, years);
Console.WriteLine();
OnlyMathLib.ColorWriteLine($"Interest: {interest:N2} Principal + Interest: {interest + principal:N2}");
}
private static void CalculateCompoundInterest()
{
Console.WriteLine();
var principal = OnlyMathLib.RequireValidDecimal("Principal Amount: ");
var rate = OnlyMathLib.RequireValidDecimal("Interest rate: ");
var years = OnlyMathLib.RequireValidDecimal("Years: ");
var frequency = OnlyMathLib.RequireValidDecimal("Times compounded per year: ");
var interest = CompoundInterest(principal, rate / 100, frequency, years);
Console.WriteLine();
OnlyMathLib.ColorWriteLine($"Interest: {interest:N2} Principal + Interest: {interest + principal:N2}");
}