MODF(3) Linux Programmers Manual MODF(3)
modf, modff, modfl - extract signed integral and fractional values from
double modf(double x, double *iptr);
float modff(float x, float *iptr);
long double modfl(long double x, long double *iptr);
Link with -lm.
The modf() function breaks the argument x into an integral part and a
fractional part, each of which has the same sign as x. The integral
part is stored in iptr.
The modf() function returns the fractional part of x.
SVr4, 4.3BSD, C89. The float and long double variants are C99 require
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