what does lookahead mean?

Answer 1

Keep your eyes in front and look straight ahead.Good luck

Answer 2

Lookahead is a term used in mathematics and computing. Basically it means that you retrieve data and carry out calculations before you know for sure that you need them. By doing the task (or at least starting it) in advance, you save time when you get to the point where you know whether it's necessary. The only downside is that from time to time you will turn out not to need them.

Answer 3

Are we talking human languages here? In human languages, that is not one word, but two.

However, in computer languages it has another meaning. Having to do with the programs that read files. They do a lookahead when they fetch more data than originally was requested, on the theory that you would ask for more after a brief delay.

Answer 4

here we go..............This is in contrast to another technique called lazy evaluation that delays the computation until it is really needed. Both techniques are used for economical usage of space or time. Lookahead makes the right decision and so avoids backtracking from undesirable stages at later stages of algorithm and so saves space, at the cost of a slight increase of time due to the overhead of extra lookups. Lazy evaluation normally skips the unexplored algorithmic paths and thus saves both the time and space in general. Some applications of lazy evaluations are demand paging in operating systems and lazy parse tables in compilers.

In search space exploration, both the techniques are used. When there are already promising paths in the algorithm to evaluate, lazy evaluation is used and to be explored paths will be saved in the queue or stack. When there are no promising paths to evaluate and to check whether the new path can be a more promising path in leading to solution, lookahead is used.

Compilers also use both the techniques. They will be lazy in generating parse tables from given rules, but they lookahead in parsing given input

Answer 5

Lookahead is a term used in mathematical discrete algorithms. The term is used in competitive analysis where online lookahead can be predictive if the definition and formula are accurate.

Answer 6

Plan for the (usually near) future.

Answer 7

well, look at it this way, "any one walking turnstyle in airport is going to bangkok" so look ahead...

Answer 8

think of the future.....

Answer 9

look in front of you ........