About: Sign and division functions

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The absolute value function returns the "size" of a number. The size of a nonnegative number X is always X itself, but if the number is negative it is -X. On implementation need the function would in C and C++ look like:

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rdfs:label	Sign and division functions
rdfs:comment	The absolute value function returns the "size" of a number. The size of a nonnegative number X is always X itself, but if the number is negative it is -X. On implementation need the function would in C and C++ look like:
dcterms:subject	Generic modules
abstract	The absolute value function returns the "size" of a number. The size of a nonnegative number X is always X itself, but if the number is negative it is -X. On implementation need the function would in C and C++ look like: double dabs (double X) { if (X >= 0) return X; return -X; } This may pose problems if the argument is int, in which case another specialized function iabs for integers and fabs for single precision float are desired. C, C++ and most other strongly typed programming languages all have this problem, but in C++ and other generic/template providing PL:s using templates is an alternative, such as in C++: template NUM abs (NUM X) { if (X >= 0) return X; return -X; } which if to be used somewhere either can be explicitly accessed like: float K; K = get_my_float_val (something); K = abs(K); or is implicitly deduced by compiler so that double D, I, X; I = abs(1); // accesses abs X = abs(1.1); // accesses abs D = abs(D); // accesses abs

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