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May 3-13, 2008


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The terms computer programs, , or just program are the  for a  computer requires programs to function, and a computer program does nothing unless its instructions are executed by a  Computer programs refer to either anam or theom which an executable program is derived (e.g., 

 
Programs written using a declarative language specify the properties that have to be met by the output and do not specify any implementation details. Two broad categories of declarative languages are and  The principle behind functional languages (like  is to not allow side-effects, which makes it easier to reason about programs like mathematical functions. is to define the problem to be solved — the goal — and leave the detailed solution to the Prolog system itself.nd another path is systematically attempted.  The principle behind logical languages (like The goal is defined by providing a list of subgoals. Then each subgoal is defined by further providing a list of its subgoals, etc. If a path of subgoals fails to find a solution, then that subgoal is from wikipedia

Computer programs can be categorized by the   used to produce them. Two of the main paradigms are

Programs written using an imperative language specify an  using declarations, expressions, and statements. declaration associates a For example: var x: integer; . An expression yields a value. For example: 2 + 2 yields 4. Finally, a statement might assign an expression to a variable or use the value of a variable to alter the program's control flow. For example: x := 2 + 2; if x == 4 then do_something(); One criticism of imperative languages is the side-effect of an assignment statement on a class of variables called non-local variables
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