go Mod()，取余运算
Mod()方法语法
func Mod(x, y float64) float64
go源码对Mod()方法的介绍：
Mod returns the floating-point remainder of x/y. The magnitude of the result is less than y and its sign agrees with that of x.
Special cases are:
Mod(±Inf, y) = NaN
Mod(NaN, y) = NaN
Mod(x, 0) = NaN
Mod(x, ±Inf) = xgolang的math.Mod()方法，接收x，y两个float64类型的参数，可用于取余运算，相当于 x-Trunc(x/y)*y，正负号与x的相同。除此之外，Mod(±Inf, y) = NaN；Mod(NaN, y) = NaN；Mod(x, 0) = NaN；Mod(x, ±Inf) = x；Mod(x, NaN) = NaN。
math.Mod()方法实例代码
func main() {
var mod_num float64 = math.Mod(11, 6)
fmt.Println(mod_num)
}运行go文件，得到输出：
5