What is L-value?

L-value:  The term "l-value" refers to values that are appropriate on the left of an asignment expression.So, l-values are location.Sometimes, an expression has no l-value.

Example:   i:=5;                   [here i is l-value]

A  B                                     [A is l-value]

A +B                                               [the expression has no l-value]

P: = Q                                         [P is served l-value]

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