non-interger exponents

Is there any way to use fractional exponents? I've tried:

Code:

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pow(base, exponent);

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with exponent being 1.2 or so and I've also tried a round-a-bout way to get the answer using:

Code:

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pow10(log10(base)*exponent);

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and all it seems to do is convert the exponent to a int and then do the math. And also I am using doubles for all my variables.

Write your own exponent function :)

If the function only takes ints for arguments then you cant pass numbers with decimal points...

hmm...

that's weird. it worked for me.

pow takes two double arguments and returns a double. it should work.

what compiler?

I'm using the Borland Command Line Compiler (not sure what version, think it's pretty recent.) And I tried hard coding an example:

Code:

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cout<<pow10(1.2)<<' '<<pow10(.3);

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and it printed: 10 1

And on the reply of me writing my own function, I'm not quite sure how to do that without using Log or 10^X. :) Haven't quite covered that in precal.

write a power series for the power function and have a certain level of precision, if you want to write your own power function. For more information look on the net for power series.

-LC

Works for me

Code:

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#include <iostream>
#include <cmath>

using namespace std;

int main ( ) {
    cout<<pow10(1.2)<<' '<<pow10(.3) << endl;
    return 0;
}

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Produces
15.8489 1.99526