Cannot implicitly convert type ‘double’ to ‘float’ with Math.Pow()

Your variables are float, but the method Math.Pow returns a double. Hence you need explicit conversion to be performed on the result of the method.

presentValue = futureValue / (float)Math.Pow(1 + rate, years);

Note: Math.Pow also takes double as parameters, but still it works. That’s because implicit conversion is taking place. Because double can represent every possible value of a float but reverse isn’t true.

Read about Implicit and Explicit conversions

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