Setting a variable to infinity

Originally Posted by c99_Draft

3 The macro HUGE_VAL
expands to a positive double constant expression, not necessarily representable as a float. The macros
HUGE_VALF
HUGE_VALL
are respectively float and long double analogs of HUGE_VAL.179)

4 The macro INFINITY
expands to a constant expression of type float representing positive or unsigned
infinity, if available; else to a positive constant of type float that overflows at
translation time.180)

179) HUGE_VAL, HUGE_VALF, and HUGE_VALL can be positive infinities in an implementation that supports infinities.