Task: Calculate a math problem with an independent variable entered by the user, in c++;

The problem I'm having is how to use the variable part, so if the equation was (2^K)/(20*K), what is the best way to set up :

So far Im on the lines of;

Obviously the equation isn't correct, just a simplified example.***Code:#include <stdio.h> #include <math.h> int main { double math, PI, x, K; printf("Enter a vlaue for variable K: "); PI = (2^K)/(20*k) ................

Thanks.