#c++小白由于上课没好好听 
寒假复习了一下指针
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复习了指针常量和常量指针
int a = 10; int b = 20; //常量指针，可修改指针的指向，不能修改指向的值 const int* p1 = &a; p1 = &b; //指针常量，可修改指针指向的值 int* const p2 = &a; *p2 = 20; //p2 = 20;（这个是错的)
然后就疑惑这个*什么时候要取什么时候不要取
https://blog.csdn.net/yuechifanfan/article/details/111588978
根据这个老哥的分析，得出了结论：
大概率当不加就是指针变量本身存储的值，加上代表指针变量指向的值
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复习了指针的自增（用指针遍历数组，不知道有什么用，先学着再说）
//用指针遍历数组 int arr[10] = { 1,2,3,4,5,6,7,8,9,10 }; int* p = arr; for(int i=0;i<10;i++) { cout << *p << endl; p++; } -
复习了值传递和地址传递
void swap01(int a, int b) { int temp = a; a = b; b = temp; cout << "a="<< a << " " <<"b=" << b << endl; } void swap02(int* p1, int* p2) { int temp = *p1; *p1 = *p2; *p2 = temp; cout << "a=" << *p1 << " " << "b=" << *p2 << endl; } int a = 10; int b = 20; //值传递 swap01(a, b); cout << "a=" << a << " " << "b=" << b << endl; cout << endl; //地址传递 swap02(&a, &b); cout << "a=" << a << " " << "b=" << b << endl;