动态申请二维数组并释放

#include <iostream> using namespace std; //定义类型A class A { public: friend class B; //类型B为友元类 private: int **p; //指向二级数组 int m_n1; //行数 int m_n2; //列数 public: A(int n1, int n2); //生成二维数据 ~A(); void InitA(); //初始化对象A }; A::A(int n1, int n2) { m_n1 = n1; //记录二维数组行数 m_n2 = n2; //记录二维数组列数 p = new int* [n1]; for(int i=0; i<n1; ++i) { p[i] = new int [n2]; } } A::~A() { for (int i=0; i<m_n1; ++i) { delete[] p[i]; } delete[] p; } void A::InitA() { for (int i=0; i<m_n1; ++i) { for (int j=0; j<m_n2; ++j) { p[i][j] = i*m_n2 + j; } } } //定义类型B class B { public: void Print(const A& a1);//打印二维数组内的元素 }; void B::Print(const A& a1) { for (int i=0; i<a1.m_n1; ++i) { for (int j=0; j<a1.m_n2; ++j) { cout << a1.p[i][j] << ' '; } cout << endl; } } int main() { A a(2, 4); a.InitA(); B b; b.Print(a); } //----------------------------------------------------------------- //----------------------------------------------------------------- //----------------------------------------------------------------- //----------------------------------------------------------------- //C++里 数组new 和delete问题 //对于数组new的不同方式 和不同的释放方法 //---------------------------------------------------------------- // 创建字符指针数组 char **parr = new char*[100]; for (int i=0;i<100;++i) { parr[i]=new char [50]; } // 释放各个字符数组 for (int i =0; i < 100; i++) delete [] parr[i]; //释放字符指针数组 delete [] parr; //--------------------------------------------------------------- // 创建数组 int *parr = new int[100]; // 释放数组 delete [] parr;