| InvalidOperationException | x is signaling NaN | 
| UnderflowException | 2x is too small to be represented | 
| OverflowException | 2x is too big to be represented | 
| InexactException | the result is inexact | 
| x | exp2(x) | 
|---|---|
| NaN | NaN | 
| ±0.0 | +1.0 | 
| -∞ | +0.0 | 
| +∞ | +∞ | 
decimal32 x = 3; assert(exp2(x) == 8);
Calculates 2x