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INFINITY

Defined in header <math.h> 
#define INFINITY /*implementation defined*/
-		 (since C99)

If the implementation supports floating-point infinities, the macro INFINITY expands to constant expression of type float which evaluates to positive or unsigned infinity.

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If the implementation does not support floating-point infinities, the macro INFINITY expands to a positive value that is guaranteed to overflow a float at compile time, and the use of this macro generates a compiler warning.

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The style used to print an infinity is implementation defined.

-

Example

Show style used to print an infinity and IEEE format.

-
#include <stdio.h>
-#include <math.h>
-#include <stdint.h>
-#include <inttypes.h>
-#include <string.h>
- 
-int main(void)
-{
-    double f = INFINITY;
-    uint64_t fn; memcpy(&fn, &f, sizeof f);
-    printf("INFINITY:   %f %" PRIx64 "\n", f, fn);
-}

Possible output:

-
INFINITY:   inf 7ff0000000000000

References

See also

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(C99)
 checks if the given number is infinite
(function macro)
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(C99)(C99)
 indicates value too big to be representable (infinity) by float, double and long double respectively
(macro constant)
C++ documentation for INFINITY
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- © cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
- https://en.cppreference.com/w/c/numeric/math/INFINITY -

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