Name | Synopsis | Description | Return Values | Errors | Usage | Attributes | See Also
c99 [ flag... ] file... -lm [ library... ] #include <math.h> double modf(double x, double *iptr);
float modff(float x, float *iptr);
long double modfl(long double x, long double *iptr);
These functions break the argument x into integral and fractional parts, each of which has the same sign as the argument. It stores the integral part as a double for the modf() function, a float for the modff() function, or a long double for themodfl() function in the object pointed to by iptr.
Upon successful completion, these functions return the signed fractional part of x.
If x is NaN, a NaN is returned and *iptr is set to NaN.
If x is ±Inf, ±0 is returned and *iptr is set to ±Inf.
No errors are defined.
a = modf(x, &iptr) ; x == a+*iptr ;
See attributes(5) for descriptions of the following attributes:
ATTRIBUTE TYPE |
ATTRIBUTE VALUE |
---|---|
Interface Stability |
Standard |
MT-Level |
MT-Safe |
Name | Synopsis | Description | Return Values | Errors | Usage | Attributes | See Also