#include <math.h>double ldexp(double x, int exp);
Upon successful completion, ldexp() returns a double representing the value x multiplied by 2 raised to the power exp.
If the value of x is NaN, NaN is returned.
If ldexp() would cause overflow, +-HUGE_VAL is returned (according to the sign of x), and errno is set to ERANGE.
If ldexp() would cause underflow to 0.0, 0 is returned and errno may be set to ERANGE.
The ldexp() function will fail if:
The value to be returned would have caused overflow.
The ldexp() function may fail if:
The value to be returned would have caused underflow.
An application wishing to check for error situations should set errno to 0 before calling ldexp(). If errno is non-zero on return, or the return value is NaN, an error has occurred.
See attributes(5) for descriptions of the following attributes:
|ATTRIBUTE TYPE||ATTRIBUTE VALUE|