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Journal Paper:
An Analysis of Some Commercial PL/1 Programs
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Finding relevant IfSQ Standards:
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Missing "else" for 50-80% of plain "if"s
50% to 80% of plain "if" statements should have had an "else" clause
IfSQ Defect Indicators:
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DP-3—Unexpected State Not Trapped
Part of a program that uses a value to switch between different branches does not trap unexpected cases.