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Until a tool (such as a speedometer, thermometer, clock, or math software) is calibrated, it may be of little use, in that the values it has may be wildly wrong. Have the tools that you use been tested to see if they are accurate?... Do you use a computer to compute numeric values, that is, numbers? Should you trust the answer produced by a computer program that does numeric computations? If that program uses the mathematical function (sine, cosine, square root, logarithm, ...) library, how much faith should you put in the answer? If the compiler does a poor job of converting decimal numbers to/from internal binary floating-point, should you trust the result? If the compiler "optimizes" the code and changes the semantics (meaning or results computed) of the code, should you trust the answer from the program?... The C computer language was recently revised and is now known as C17; the older versions (ANSI C89, ISO C90, ISO C95, ISO C99, ISO C11) are no longer standards. FPCE..