help with math statement...

[ZeBula]

new to C#... trying to build a compound interest calculation.
the error i get is in the for loop on the line:

amount = principal * (1 + rate) ^ year;

"Operator "*" cannot be applied to operands of type "decimal" and "double"

also i noticed in this line, the ^ .(in vb the ^ is for exponents),
i want to know if there is an equivalent in C#.

can anyone guide me to the light?

double rate;
int year;
string output;
decimal amount, principal;

principal = System.Convert.ToDecimal(txtDeposit.Text);
rate = System.Convert.ToDouble(txtInterest.Text);

output = "Year     Amount on Deposit"

for(int iX = 1; iX < 11; iX++)
{
    amount = principal * (1 + rate) ^ year;
    ouput += iX + "     " + System.String.Format("{0:C}", amount) + "\n";
}

MessageBox.Show(output, "Compound Interest");

thanks in advance

[hellswraith]

I haven't worked with decimals, but you probably need to explicitly cast the double into a decimal:

amount = principal * (1 + (decimal)rate) ^ year;

[ZeBula]

but then the error i get is then

"Operator "^" cannot be applied to operands of type "double" and "double"

between the "(1 + (decimal)rate) ^ year;" part


i think it may have something to do with that ^ operator.... not sure though...

still trying to find out which operator is for exponentials....

thanks..

[sunburnt]

^ is the exclusive or operator (xor); there is no operator for powers. You can use the Math.Pow() function instead.