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This macro contains the IEEE representation of positive infinity, +\infty. It is computed from the expression
+1.0/0.0
.
This macro contains the IEEE representation of negative infinity, -\infty. It is computed from the expression
-1.0/0.0
.
This macro contains the IEEE representation of the Not-a-Number symbol,
NaN
. It is computed from the ratio0.0/0.0
.
This function returns +1 if x is positive infinity, -1 if x is negative infinity and 0 otherwise.
This function returns 1 if x is a real number, and 0 if it is infinite or not-a-number.