1. 存储变量值的内存

/*
- 指针是一个变量，与所有变量一样，指针也占用内存空间- 指针的特殊之处在于，指针包含的值（这里为0x558）被解读为内存地址，因此指针是一种指向内存单元的特殊变量- 引用运算符（&）也叫地址运算符
*/#include <iostream>
using namespace std;int main(){int age = 30;const double pi = 3.1416;// use & to get the address of a variable// 作为一种约定，显示十六进制数时，应加上文本0xcout << "Integer age is at: 0x" << &age << endl;cout << "Double pi is located at: 0x" << hex << &pi << endl;return 0;
}

2. 声明并初始化指针

#include <iostream>
using namespace std;int main(){int age = 40;int* pointer = &age; // pointer to an int, initialized to &age// displaying the value of pointercout << "Integer age is at: 0x" << hex << pointer << endl;return 0;
}

3.引用运算符

/*这个程序表明，同一个int指针（pInteger）可指向任何int变量*/
#include <iostream>
using namespace std;int main(){int age = 30;int* pointer = &age; //pointer stores the address of agecout << "pointer points to age now" << endl;// displaying the value of pointercout << "pointer = 0x" << hex << pointer << endl;int dogs_age = 9;pointer = &dogs_age; //pointer now points to dogs_agecout << "pointer now points to dogs_age" << endl;cout << "pointer = 0x" << hex << pointer << endl;return 0;
}

4. 解除引用运算符

/*解除引用运算符（*）也叫间接运算符*/
#include <iostream>
using namespace std;int main(){int age = 18;int dogs_age = 3;int* pointer = &age;cout << "pointer points to age" << endl;cout << "*pointer = " << *pointer << endl;pointer = &dogs_age;cout << "pointer points to dogs_age now" << endl;cout << "*pointer = " << *pointer << endl;int* pointer_1 = &dogs_age;cout << "Enter an age for your dog: ";cin >> *pointer_1;cout << "Your dog is " << *pointer_1 << " years old." << endl;return 0;
}