ldexp - load exponent of a floating point number
#include <math.h> double ldexp(double x, int exp);
The ldexp() function computes the quantity x * 2exp.
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.
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 and errno may be set to [EDOM].
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, 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 argument x is NaN.
- The value to be returned would have caused underflow.
No other errors will occur.
frexp(), isnan(), <math.h>.
Derived from Issue 1 of the SVID.