m0_37715028的博客

#include <iostream>using namespace std;int fun(unsigned int x) { int n = 0; while (x + 1) { n++; x = x | (x + 1); } return n;}int fun2(unsigned int x) { int n = 0; while (x) { n++; x = x & (x - 1); } return n;}int main.

#include <iostream>using namespace std;void fun(int* p1, int* p2, int* t){ t = (int*)malloc(sizeof(int)); cout << "fun:t,address: " << &t << endl; *t = *p1 + *(p2++);}int main(){ int a[2] = { 1,2 }; int b[2] = { 10.

1. 概念dynamic_cast: 该运算符用于将基类的指针或引用安全的转换成派生类的指针或引用,具有运行时类型识别(run-time type identification,RTTI)的功能。static_cast:任何明确定义的类型转换，只要不包含底层const，都可以使用static_cast.2.举例#include <stdio.h>using namespace std;struct A1{ virtual ~A1(){}};struct A2{