MirOS Manual: scalbn(3), scalbnf(3)

```SCALBN(3)                  BSD Programmer's Manual                   SCALBN(3)
```

NAME

```     scalbn, scalbnf - exponent using FLT_RADIX
```

LIBRARY

```     libm
```

SYNOPSIS

```     #include <math.h>

double
scalbn(double x, int n);

float
scalbnf(float x, int n);
```

DESCRIPTION

```     The scalbn() and scalbnf() functions compute x * r^n, where r is the ra-
dix of the machine's floating point arithmetic, defined by the FLT_RADIX
constant in <float.h>. The rationale is efficiency; r^n is not computed
explicitly.
```

RETURN VALUES

```     As described above, upon successful completion, the described functions
return the exponent computed using FLT_RADIX. Otherwise the following may
occur:

1.   When the result would cause an overflow, a range error occurs
and +-HUGE_VAL, +-HUGE_VALF, or +-HUGE_VALL is returned ac-
cording to the sign of x and the return type of the
corresponding function.

2.   When the correct value would cause an underflow and it is not
representable, a range error occurs and either 0.0 or an
implementation-defined value is returned. When an underflow
occurs but the correct value is representable, a range error
occurs but the correct value is returned.

3.   If x is +-0 or +-Inf, x is returned. Likewise, if n is zero, x
is returned. If x is NaN, NaN is returned.
```

```     exp(3), frexp(3), ldexp(3), math(3)
```

STANDARDS

```     The described functions conform to ISO/IEC 9899:1999 ("ISO C99").

MirOS BSD #10-current          February 9, 2014                              1```

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