Having trouble with compound interest program

namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
//prompt user to enter principal
Console.WriteLine( "enter principle:");
string principalInput = Console.ReadLine();
double principal = Convert.ToDouble(principalInput);
//make sure princiapl is not negative
if (principal < 0)
{
Console.WriteLine("Principal cannot be negative");
principal = 0;
}
//enter intrest rate
Console.WriteLine("enter intrest rate");
string intrestInput = Console.ReadLine() ;
double intrest = Convert.ToDouble(intrestInput);
//make sure intrest is not negative.
if (intrest < 0)
{
Console.WriteLine("intrest cannot be negative");
intrest = 0;
}
//calculate the value of principal plus intrest.
double intrestPaid= principal*(intrest/100);
//now calculate the total
double total = principal + intrestPaid;
// output the result
Console.WriteLine();//skip a line
Console.WriteLine("principal =" +principal);
Console.WriteLine("Intrest ="+ intrest + "%");
Console.WriteLine();
Console.WriteLine("intrest paid =" +intrestPaid);
Console.WriteLine("Total =" +total);
Console.WriteLine("If you want compound intrest enter the number of years,if not close now");
string years1=Console.ReadLine();
double years2 = Convert.ToDouble(years1);
double CompoundIntrest = principal * ((double)Math.Pow(1.0+intrest, years2));
Console.WriteLine("Compound intrest is" +CompoundIntrest);
//Wait for response then tell the user how to leave
Console.WriteLine ("Press Enter to Terminate...");
Console .Read() ;
I beleive the error here is that i have used Math.Pow which is what my friend has told me to use
the purpose i to figure out a compound intrest so if the princaple is 100 and teh intrest 10 and years is 2 i should get 121
can somebody rewrite this for me and tell me what would work
thank you forums

You are very close and even have identified the correct line that is in error.

Code:

---

double CompoundIntrest = principal * ((double)Math.Pow(1.0+intrest, years2));

---

Look carefully at the value stored in intrest (hint: it shouldn't be > 1). To compound at, say, 30 percent interest you would perform the following calculation:

Principle * (1.3)^(years)

Does that make it clear now you need to modify the program? Try some things and if you still have problems let us know.

Also, this is unrelated: Also Math.Pow returns a double, so you don't need to use a cast.