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CS605 - Software Engineering II - Lecture Handout 30

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Statistical Software Quality Assurance

Statistical SQA is a technique that measures the quality in a quantitative fashion. It implies that information about defects is collected and categorized and an attempt is made to trace each defect to underlying cause. It uses Pareto Principle to identify vital causes (80% of defects can be traced to 20% of causes) and moves to correct the problems that have caused the defects.

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CS606 - Compiler Construction - Lecture Handout 34

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Let’s go through an example of using YACC to implement the ad-hoc scheme for an arithmetic calculator.

The YACC file for a calculator grammar is as follows:

%token NUMBER LPAREN RPAREN
%token PLUS MINUS TIMES DIVIDE
%%

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