【總結】C/C++取餘操做：%、fmod()、remainder()的區別和聯繫

定義

fmod

double fmod (double numer     , double denom);
float fmod (float numer      , float denom);
long double fmod (long double numer, long double denom);
double fmod (Type1 numer      , Type2 denom);       // additional overloads

Compute remainder of division
Returns the floating-point remainder of numer/denom (rounded towards zero):

fmod = numer - tquot * denom

Where tquot is the truncated (i.e., rounded towards zero) result of: numer/denom.

remainder

double remainder (double numer     , double denom);
float remainder (float numer      , float denom);
long double remainder (long double numer, long double denom);
double remainder (Type1 numer      , Type2 denom);       // additional overloads

Compute remainder (IEC 60559)
Returns the floating-point remainder of numer/denom (rounded to nearest):

remainder = numer - rquot * denom

Where rquot is the result of: numer/denom, rounded toward the nearest integral value (with halfway cases rounded toward the even number).

%

int numer
int denom
numer%denom
取模運算符，是算術運算符的一種。操做數只能是整數。
返回整除後的餘數。

聯繫

1.都是取餘運算

未完待續