Evaluate $\lfloor-2.54\rfloor+\lceil25.4\rceil$.
To evaluate this expression, I need to recall the definitions of the floor and ceiling functions. The floor function rounds a number down to the nearest integer, while the ceiling function rounds a number up to the nearest integer. For example, $\lfloor3.7\rfloor=3$ and $\lceil-1.2\rceil=-1$. Applying these definitions to the given expression, I get $\lfloor-2.54\rfloor+\lceil25.4\rceil=-3+26=23$. 