Question

So I realize that #include is necessary, and that there is a pow(x,y) where x^y works…but when I attempted to use pow(2,(num-1)), it kicked back an error…

errorC2668: ‘pow’ : ambiguous call to overloaded function

the line of code I have for it is as follows

perfect = (pow(2,(num-1))) * (pow(2,num)-1); 

Any recommendations?

Thanks in advance

EDIT:

num is indeed declared as an int.

num does have a value, starts at 1 and goes to UINT_MAX

Added an asterisk to equation

Answer 1

The compiler doesn’t know which pow() function to call. The overloads listed here gives the following list:

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

The compiler won’t guess which one to use. Make it explicit with a casts.

perfect = (pow(2.,(double)(num-1))) < (pow(2.,(double)num)-1); 

There may be some extra casts there, but they won’t hurt anything.