Description: LL (1) grammar is used to determine the top-down analysis techniques. LL (1) the meaning is: the first show that L is top-down analysis from left to right scan input strings, the first two L analysis showed that the process is derived using the most left, look to the right one shows that only a symbol will be can decide how derived, that is, to choose which production (rule) for derivation. LL (1) determine the needs of grammar followed by calculation of FIRST sets, FOLLOW sets and SELLECT set, and then determine whether to LL (1) grammar, sentence analysis of the final again.
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