modf(3m) - osol9

1modf(3M)                Mathematical Library Functions                modf(3M)
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NAME

6       modf, modff, modfl - decompose floating-point number
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SYNOPSIS

9       c99 [ flag... ] file... -lm [ library... ]
10       #include <math.h>
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12       double modf(double x, double *iptr);
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15       float modff(float x, float *iptr);
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18       long double modfl(long double x, long double *iptr);
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DESCRIPTION

22       These  functions  break  the  argument  x  into integral and fractional
23       parts, each of which has the same sign as the argument. It  stores  the
24       integral  part  as  a  double  for the modf() function, a float for the
25       modff() function, or a long  double  for  themodfl()  function  in  the
26       object pointed to by iptr.
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RETURN VALUES

29       Upon  successful  completion,  these  functions return the signed frac‐
30       tional part of x.
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33       If x is NaN, a NaN is returned and *iptr is set to NaN.
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36       If x is ±Inf, ±0 is returned and *iptr is set to ±Inf.
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ERRORS

39       No errors are defined.
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USAGE

42       These functions compute the function result and *iptr such that:
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44         a = modf(x, &iptr) ;
45         x == a+*iptr ;
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ATTRIBUTES

49       See attributes(5) for descriptions of the following attributes:
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54       ┌─────────────────────────────┬─────────────────────────────┐
55       │      ATTRIBUTE TYPE         │      ATTRIBUTE VALUE        │
56       ├─────────────────────────────┼─────────────────────────────┤
57       │Interface Stability          │Standard                     │
58       ├─────────────────────────────┼─────────────────────────────┤
59       │MT-Level                     │MT-Safe                      │
60       └─────────────────────────────┴─────────────────────────────┘
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