In a compiler the module that checks every character of the source text is called:

Consider the following grammar: $$\eqalign{ & S \to S \cr & S \to SS\,|\,a\,|\,\varepsilon \cr} $$ (a) Co

The complement(s) of the element 'a' in the lattice shown in Fig. is (are) ........... .

Solve the recurrence equations: $$\,\,\,\,\,\,\,\,\,\,T\left( n \right) = \left( {{n \over 2}} \right) + 1$$ $$\,\,\,\,

State an undesirable characteristic of each of the following criteria for measuring performance of an operating system: