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Warning: main() [function.include]: Failed opening '/www/www/htdocs/style/globals.php' for inclusion (include_path='.:/www/www/common:/www/www/php/lib/php') in /www/www/docs/6.4.1/neutrino/lib_ref/i/isinf.html on line 1
Warning: main(/www/www/htdocs/style/header.php) [function.main]: failed to open stream: No such file or directory in /www/www/docs/6.4.1/neutrino/lib_ref/i/isinf.html on line 8
Warning: main() [function.include]: Failed opening '/www/www/htdocs/style/header.php' for inclusion (include_path='.:/www/www/common:/www/www/php/lib/php') in /www/www/docs/6.4.1/neutrino/lib_ref/i/isinf.html on line 8
Test for infinity
#include <math.h>
#define isinf ( x ) ...
- x
- The number that you want to test.
libm
Use the -l m option to
qcc
to link against this library.
The isinf() macro tests to see
if a number is “infinity.”
- 1
- The value of x is infinity.
- ≠ 1
- The value of x isn't infinity.
#include <stdio.h>
#include <errno.h>
#include <inttypes.h>
#include <math.h>
#include <fpstatus.h>
int main(int argc, char** argv)
{
double a, b, c, d;
a = 2;
b = -0.5;
c = NAN;
fp_exception_mask(_FP_EXC_DIVZERO, 1);
d = 1.0/0.0;
printf("%f is %s \n", a,
(isinf(a)) ? "infinite" : "not infinite");
printf("%f is %s \n", b,
(isinf(b)) ? "infinite" : "not infinite");
printf("%f is %s \n", c,
(isinf(c)) ? "infinite" : "not infinite");
printf("%f is %s \n", d,
(isinf(d)) ? "infinite" : "not infinite");
return(0);
}
produces the output:
2.000000 is not infinite
-0.500000 is not infinite
NAN is not infinite
Inf is infinite
ANSI,
POSIX 1003.1
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
No |
Thread |
Yes |
isfinite(),
isnan()
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