FREXP(3M) | Mathematical Library Functions | FREXP(3M) |

frexp, frexpf, frexpl - extract mantissa and exponent from a floating-point number

c99 [flag... ]file...-lm[library... ] #include <math.h>doublefrexp(doublenum,int *exp);

floatfrexpf(floatnum,int *exp);

long doublefrexpl(long doublenum,int *exp);

These functions break a floating-point number into a normalized
fraction and an integral power of 2. They store the integer exponent in the
**int** object pointed to by *exp*.

For finite arguments, these functions return the value *x*,
such that *x* is a **double** with magnitude in the interval
[½, 1) or 0, and *num* equals *x* times 2 raised to the
power **exp*.

If *num* is NaN, NaN is returned and the value of **exp*
is unspecified.

If *num* is ± 0, ± 0 is returned and the value
of **exp* is 0.

If *num* is ±Inf, *num* is returned and the value
of **exp* is unspecified.

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE | ATTRIBUTE VALUE |

Interface Stability | Standard |

MT-Level | MT-Safe |

July 12, 2006 | SunOS 5.11 |