const的用法

int main(){
int num = 6;
int* p = #
const int* p1 = #               //const在*号左边 -> 被指物为常量
int* const p2 = #               //const在*号右边 -> 指针本身为常量
const int* const p3 = #   //被指物和指针本身都为常量
}

int function(bla...) const {...}