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isinf.0
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1992-08-10
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ISINF(3) UNIX Programmer's Manual ISINF(3)
NNAAMMEE
iissiinnff, iissnnaann - test for infinity or notanumber (_N_a_N)
SSYYNNOOPPSSIISS
_i_n_t
iissiinnff(_d_o_u_b_l_e)
_i_n_t
iissnnaann(_d_o_u_b_l_e)
DDEESSCCRRIIPPTTIIOONN
The iissnniinnff() function returns 1 if the number is ``infinity'', otherwise
0.
The iissnnaann() function returns 1 if the number is ``_N_a_N'', otherwise 0.
SSEEEE AALLSSOO
math(3)
_I_E_E_E _S_t_a_n_d_a_r_d _f_o_r _B_i_n_a_r_y _F_l_o_a_t_i_n_g__P_o_i_n_t _A_r_i_t_h_m_e_t_i_c, Std 7541985, ANSI.
BBUUGGSS
Neither the VAX nor the Tahoe floating point have distinguished values
for either infinity or notanumber. These routines always return 0 on
those architectures.
BSD Experimental April 20, 1991 1