Pow!

[Ben Duncan]

A couple of nights back whilst revising for my math GCSE, I flicked through the beggining of a book I had when I reached interests.

I thought I'd create a program that finds out the compund interest of something for x amount of years, but the pow() operator(?) doesn't accept variables.

I was just wondering if there was any way around this.

[hanst99]

pow is a function, not an operator. You need to #include <cmath> for it.


http://cplusplus.com/reference/clibrary/cmath/pow/

[ne555]

double pow ( double base, double exponent );
long double pow ( long double base, long double exponent );
float pow ( float base, float exponent );
double pow ( double base, int exponent );
long double pow ( long double base, int exponent );

template<class T> complex<T> pow (const complex<T>& x, int y);
template<class T> complex<T> pow (const complex<T>& x, const complex<T>& y);
template<class T> complex<T> pow (const complex<T>& x, const T& y);
template<class T> complex<T> pow (const T& x, const complex<T>& y);

template<class T> valarray<T> pow (const valarray<T>& x, const valarray<T>& y);
template<class T> valarray<T> pow (const valarray<T>& x, const T& y);
template<class T> valarray<T> pow (const T& x, const valarray<T>& y);

¿what are you talking about?
pow is a function, ¿how are you calling it?

[Ben Duncan]

Well, I was doing something along the lines of:

pow(interestrate/100,3)

Unfortunately, that doesn't work, I was wondering if there was any way around that problem.

(It doesn't really matter if there isn't, it was just annoying)

[hanst99]

It does work fine. You are just doing something wrong.
writing 3.0 instead of 3 may fix your "problem" though if interestrate is an integer.

[wolfgang]

Is interestrate an int or double?

Make sure to use () around that expression. See if it fixes your problem.

[Ben Duncan]

Ah, it's fixed now. Thank you!