cppreference.com > Standard C Math > pow pow Syntax:
      #include <math.h>
      double pow( double base, double exp );
The pow() function returns base raised to the expth power. There's a domain error if base is zero and exp is less than or equal to zero. There's also a domain error if base is negative and exp is not an integer. There's a range error if an overflow occurs. Related topics: exp log sqrt