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c99 [ flag... ] file... -lm [ library... ] #include <math.h> double scalbln(double x, long n);
float scalblnf(float x, long n);
long double scalblnl(long double x, long n);
double scalbn(double x, int n);
float scalbnf(float x, int n);
long double scalbnl(long double x, int n);
These functions compute x * FLT_RADIX^n efficiently, not normally by computing FLT_RADIX^n explicitly.
Upon successful completion, these functions return x * FLT_RADIX^n>.
If the result would cause overflow, a range error occurs and these functions return \(+-HUGE_VAL, \(+-HUGE_VALF, and \(+-HUGE_VALL (according to the sign of x) as appropriate for the return type of the function.
If x is NaN, a NaN is returned.
If x is \(+-0 or \(+-Inf, x is returned.
If x is 0, x is returned.
These functions will fail if:
Range Error
The result overflows. If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, then the overflow floating-point exception is raised.
An application wanting to check for exceptions should call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an exception has been raised. An application should either examine the return value or check the floating point exception flags to detect exceptions.
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Interface Stability | Standard |
| MT-Level | MT-Safe |
feclearexcept(3M), fetestexcept(3M), math.h(3HEAD), scalb(3M), attributes(5), standards(5)