[C++]cpp小笔记3

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[C++]cpp小笔记3

注：语法：在头文件中的变量，只有static const类型的变量才能被初始化！！

1. Struct的声明。

、
在头文件中：

public:struct Person {char name[20];int height;int weight;};struct Food {string name;int weight;} orange, apple;struct Point {int x;int y;} point;struct Circle {Point point;int radius;};struct {string name;} test;

注意最后一个test因为没有定义struct type name,所以这个struct无法在后面在定义新的类型。

2. Struct的使用

	Person me = {"x", 187, 190};Person Parents[] = {{"y", 166, 100},{"z", 170, 150}};cout << "Person: " << me.name <<" is " << me.height << " tall and " << me.weight <<" weight"<< endl;int size = sizeof(Parents) / sizeof(Person);for(int i = 0; i < size; i ++) {cout << "Person: " << Parents[i].name <<" is " << Parents[i].height << " tall and " << Parents[i].weight <<" weight"<< endl;}apple = {"apple", 12};orange = {"orange", 13};cout << "Food: " << orange.name <<" is " << orange.weight <<" weight"<< endl;Food banana={"banana", 14};Food strawberry;strawberry.name="strawberry";strawberry.weight = 18;

        Circle circle= {{10,20}, 20};
	cout << "The point of a circle is "<<circle.point.x << " and " <<circle.point.y << " ,and radius is" << circle.radius<<endl;

use pointer to access structures

Point * point;
point->x = 10;
point->y = 20;