Compile-Time Function Evaluation — Also known as CTFE; if D has enough information to evaluate a function at compile time, it will do so.  If you write factorial(12)*sin(0)*180/3.14, the result will be compiled directly into the program.

Compile-Time Function Evaluation — Also known as CTFE; if D has enough information to evaluate a function at compile time, it will do so.  If you write sin(0)*180/3.14, the result will be compiled directly into the program.