c++中value+=static_cast<int>(power(2,

c++中value+=static_cast<int>(power(2,
c++中value+=static_cast<int>(power(2,

c++中value+=static_cast<int>(power(2,
value += static_cast(power(2,i0));
power(float x,float y)
power(double x,double y)
均返回x的y次方,返回值类型分别为float和double,
你这个语句相当于将power返回的结果强制转换为int整型~