If the implementation supports floating-point infinities, the macroINFINITY expands to constant expression of typefloat which evaluates to positive or unsigned infinity.

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

The style used to print an infinity is implementation defined.

[edit]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);}

INFINITY:   inf 7ff0000000000000

[edit]References

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