What is an undefined reference/unresolved external symbol error and how do I fix it?

c++c++-faqlinker-errorsundefined-referenceunresolved-external
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"Notice: Undefined variable", "Notice: Undefined index", "Warning: Undefined array key", and "Notice: Undefined offset" using PHP

arraysphpvariableswarningsundefined-index
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The Definitive C++ Book Guide and List

c++c++-faq
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How do I compare strings in Java?

javastringequality
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Is floating point math broken?

mathlanguage-agnosticfloating-pointfloating-accuracy
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