How to use an exponent?

[abrown07]

Another noob question.
How do i write out an exponent in my C code.

I want to say

Population= N*exponent(r)

[donbock]

Do you mean N raised to the rth power?
Do you mean N times e to the rth power?

[jkmyoung]

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

If you actually mean N* e^r see:

http://www.cplusplus.com/reference/clibrary/cmath/exp/