MOOC清华《面向对象程序设计》第2章：new/delete运算符实验

测试代码：

#include <iostream>using namespace std;int main(){for(int i = 0; i < 10; i++){switch(i){case 0 :{int* ptr = new int;cout << "case 0 :" << endl;cout <<"赋值前 *ptr = " << *ptr << endl;cout <<"赋值前 ptr = " << ptr << endl;*ptr = 8;cout << "直接赋值后 *ptr = " << *ptr << endl;cout << "直接赋值后 ptr = " << ptr << endl;int a = 9;*ptr = a;cout << "间接赋值后(1) *ptr = " << *ptr << endl;cout << "间接赋值后(1) ptr = " << ptr << endl;int b = 10;ptr = &b;cout << "间接赋值后(2) *ptr = " << *ptr << endl;cout << "间接赋值后(2) ptr = " << ptr << endl;cout << "sizeof(*ptr) = " << sizeof(*ptr) << endl;cout << "sizeof(ptr) = " << sizeof(ptr) << endl << endl;delete ptr;break;}case 1 :{int* array = new int[10];cout << "case 1 :" << endl;cout << "赋值前 ";for(int j = 0; j < 10; j++)cout << "array[" << j << "] = " << array[j] << endl;cout << endl;for(int j = 0; j < 10; j++)array[j] = j + 10;cout << "赋值后 ";for(int j = 0; j < 10; j++)cout << "array[" << j << "] = " << array[j] << endl;cout << endl;cout << "sizeof(array[0]) = " << sizeof(array[0]) << endl;cout << "sizeof(array) = " << sizeof(array) << endl;delete[] array;break;}default : break;}}return 0;}

测试结果：

Debug经验：

1，注意指针本身与指针所指变量之间的区别，加星号*与不加星号的区别；

2，case标号后若涉及到变量定义或赋初值，最好每一段case语句段加上一对花括号{}，让程序清晰无误。