Each of the macros defined in<errno.h> expands to an integer constant expression with typeint and with a unique positive value. The following constants are defined by ISO C. The implementation may define more, as long as they begin with'E' followed by digits or uppercase letters.

[edit]Notes

Many additional errno constants aredefined by POSIX and by theC++ standard library, and individual implementations may define even more, e.g.errno(3) on Linux orintro(2) on BSD and OS X.

[edit]Example

#include <errno.h>#include <math.h>#include <stdio.h>#include <string.h> int main(void){errno=0;printf("log(-1.0) = %f\n",log(-1.0));printf("%s\n\n",strerror(errno)); errno=0;printf("log(0.0)  = %f\n",log(0.0));printf("%s\n",strerror(errno));}

log(-1.0) = nanNumerical argument out of domain log(0.0)  = -infNumerical result out of range

[edit]References

[edit]See also

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