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c99 [ flag... ] file... -lm [ library... ] #include <math.h> double fmod(double x, double y);
float fmodf(float x, float y);
long double fmodl(long double x, long double y);
These functions return the floating-point remainder of the division of x by y.
These functions return the value x - i * y, for some integer i such that, if y is non-zero, the result has the same sign as x and magnitude less than the magnitude of y.
If x or y is NaN, a NaN is returned.
If y is 0, a domain error occurs and a NaN is returned.
If x is infinite, a domain error occurs and a NaN is returned.
If x is \(+-0 and y is not 0, \(+-0 is returned.
If x is not infinite and y is \(+-Inf, x is returned.
These functions will fail if:
Domain Error
The x argument is infinite or y is 0. If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, the invalid floating-point exception is raised.
An application wanting to check for exceptions should call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an exception has been raised. An application should either examine the return value or check the floating point exception flags to detect exceptions.
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Interface Stability | Standard |
| MT-Level | MT-Safe |
feclearexcept(3M), fetestexcept(3M), isnan(3M), math.h(3HEAD), attributes(5), standards(5)