Tests whether a given floating-point value is normalized #include <math.h> int isnormal ( float x ); int isnormal ( double x ); int isnormal ( long double x ); The macro isnormal( ) yields a nonzero value (that is, TRue) if its argument's value is a normalized floating-point number. Otherwise, isnormal( ) yields 0. The argument must be a real floating-point type. The rule that floating-point types are promoted to at least double precision for mathematical calculations does not apply here; the argument's properties are determined based on its representation in its actual semantic type. Exampledouble maximum( double a, double b ) { if ( isnormal( a ) && isnormal( b ) ) // Handle normal case first. return ( a >= b ) ? a : b ; else if ( isnan( a ) || isnan( b ) ) { /* ... */ See Alsofpclassify( ), isfinite( ), isinf( ), isnan( ), signbit( ) |