How to raise a double value by power of 12?

Question

I have a double which is:

double mydouble = 10;

and I want 10^12, so 10 * 10 * 10 * 10 * 10 * 10 * 10 * 10 * 10 * 10 * 10 * 10. I tried

Answer 1

try pow(10.0, 12.0). Better yet, #include math.h.

To clarify: If you don't include math.h, the compiler assumes that pow() returns an integer. Including math.h brings in a prototype like

double pow(double, double);

So the compiler can understand how to treat the arguments and the return value.