DragonFly On-Line Manual Pages

ISGREATER(3)	      DragonFly Library Functions Manual	  ISGREATER(3)


isgreater, isgreaterequal, isless, islessequal, islessgreater, isunordered -- compare two floating-point numbers


Standard C Library (libc, -lc)


#include <math.h> int isgreater(real-floating x, real-floating y); int isgreaterequal(real-floating x, real-floating y); int isless(real-floating x, real-floating y); int islessequal(real-floating x, real-floating y); int islessgreater(real-floating x, real-floating y); int isunordered(real-floating x, real-floating y);


Each of the macros isgreater(), isgreaterequal(), isless(), islessequal(), and islessgreater() take arguments x and y and return a non-zero value if and only if its nominal relation on x and y is true. These macros always return zero if either argument is not a number (NaN), but unlike the corresponding C operators, they never raise a floating point exception. The isunordered() macro takes arguments x and y and returns non-zero if and only if neither x nor y are NaNs. For any pair of floating-point values, one of the relationships (less, greater, equal, unordered) holds.


fpclassify(3), math(3), signbit(3)


The isgreater(), isgreaterequal(), isless(), islessequal(), islessgreater(), and isunordered() macros conform to ISO/IEC 9899:1999 (``ISO C99'').


The relational macros described above first appeared in FreeBSD 5.1. DragonFly 4.3 July 27, 2013 DragonFly 4.3