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man pages->FreeBSD man pages -> significandf (3)
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## IEEE_TEST(3)

```
```

### NAME[Toc][Back]

```     logb, logbf, scalb, scalbf, significand, significandf -- IEEE test functions

```

### LIBRARY[Toc][Back]

```     Math Library (libm, -lm)
```

### SYNOPSIS[Toc][Back]

```     #include <math.h>

double
logb(double x);

float
logbf(float x);

double
scalb(double x, double n);

float
scalbf(float x, float n);

double
significand(double x);

float
significandf(float x);
```

### DESCRIPTION[Toc][Back]

```     These functions allow users to test conformance to IEEE Std 754-1985.
Their use is not otherwise recommended.

logb(x) and logbf(x) return x's exponent n, a signed integer converted to
double-precision floating-point.  logb(+-infinity) = +infinity; logb(0) =
-infinity with a division by zero exception.

scalbn(x, n) and scalbnf(x, n) return x*(2**n) computed by exponent
manipulation.

significand(x) and significandf(x) return sig, where x := sig * 2**n with
1 <= sig < 2.  significand(x) and significandf(x) are not defined when x
is 0, +-infinity, or NaN.
```

### SEE ALSO[Toc][Back]

```     ieee(3), math(3)
```

### STANDARDS[Toc][Back]

```     IEEE Std 754-1985

FreeBSD 5.2.1			March 10, 1994			 FreeBSD 5.2.1```
[ Back ]
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