プログラマ専用SNS ミクプラ

コード:

class A{
   private:
        AMap *p_a_map;
        Unit   *p_unit;
        bool  error;
   public:
          A(int number = 0);
          void Update();
          void Draw();
};

A::A(int number){

       char *str;

     switch(number){
         case 0:
            error = true;
            break;
        case 1:
            str = "map1.csv";
            break;
        //マップの数だけ同じ処理

         //ファイルのオープン

         a_map.aa =  //それぞれの項目を読み込み

        p_a_map = *a_map;

     } 
}

コード:

#include <cstdio>
#include <cstdlib>

typedef int AMap;

class A{
	private:
		static int num;
		//AMap *p_a_map = (AMap *)malloc(sizeof(AMap)*num);
		int n = num;
	public:
		void print() const {
			printf("%d\n",n);
		}
		static void set_num(int n_) {
			num = n_;
		}
}

;int A::num;

int main(){
	A::set_num(10);
	A a;
	A::set_num(5);
	A b;
	a.print();
	b.print();
	return 0;
}

コード:

#include <cstdio>

typedef char MapChip;
typedef int Unit;

class AMap {
	private:
		int width, height;
		int next_map;
		MapChip *m;
	public:
		AMap(int w = 1, int h = 1) {
			// w, hの値のエラーチェックは省略
			width = w;
			height = h;
			m = new MapChip[w * h];
		}
		AMap(const AMap& a) {
			width = a.width;
			height = a.height;
			next_map = a.next_map;
			m = new MapChip[width * height];
			for (int i = 0; i < width * height; i++) m[i] = a.m[i];
		}
		~AMap() {
			delete[] m;
		}
		AMap& operator=(const AMap& a) {
			width = a.width;
			height = a.height;
			next_map = a.next_map;
			delete[] m;
			m = new MapChip[width * height];
			for (int i = 0; i < width * height; i++) m[i] = a.m[i];
			return *this;
		}
		const MapChip& at(int x, int y) const {
			return m[width * y + x];
		}
		MapChip& at(int x, int y) {
			return m[width * y + x];
		}
		int get_width() const {
			return width;
		}
		int get_height() const {
			return height;
		}
		int get_next_map() const {
			return next_map;
		}
		void set_next_map(int n) {
			next_map = n;
		}
		static AMap load(const char *data) {
			// ダミー
			AMap map = AMap(10, 10);
			const char *p = data;
			for (int y = 0; y < 10; y++) {
				for (int x = 0; x < 10; x++) {
					map.at(x, y) = *(p++);
					if (*p == '\0') p = data;
				}
			}
			return map;
		}
};

class A {
	private:
		AMap *p_a_map;
		Unit *p_unit;
		bool error;
	public:
		A(int number = 0);
		~A();
		void Update();
		void Draw();
};

A::A(int number) {
	const char *str;

	p_a_map = NULL;
	p_unit = NULL;
	error = false;

	switch(number) {
		case 0:
			error = true;
			break;
		case 1:
			str = "map1.csv";
			break;
		default:
			error = true;
			break;
	}

	if(!error) {
		// 読み込み処理のかわり
		int map_num = 3;
		p_a_map = new AMap[map_num];
		p_a_map[0] = AMap::load("asumikana");
		p_a_map[0].set_next_map(2);
		p_a_map[1] = AMap::load("kitamuraeri");
		p_a_map[1].set_next_map(-1);
		p_a_map[2] = AMap::load("kugimiyarie");
		p_a_map[2].set_next_map(1);
		(void)str; // 警告避け
	}
}

A::~A() {
	if(p_a_map != NULL) delete[] p_a_map;
}

void A::Update() {
}

void A::Draw() {
	puts("++++++++++");
	if (p_a_map != NULL) {
		for (int map = 0; map >= 0; map = p_a_map[map].get_next_map()) {
			for (int y = 0; y < p_a_map[map].get_height(); y++) {
				for (int x = 0; x < p_a_map[map].get_width(); x++) {
					putchar(p_a_map[map].at(x, y));
				}
				putchar('\n');
			}
			puts("=====");
		}
	}
	puts("----------");
}

int main(void) {
	A a1 = 0;
	A a2 = 1;
	puts("draw a1");
	a1.Draw();
	puts("draw a2");
	a2.Draw();
	return 0;
}

コード:

  int*  getA(){
       int a = 7;
       return &a
   }

   int main(){
       int *a;
       a = getA();
       *a = 3;
    }

コード:

class A{
   pirivate:
       B *p_b;
   public:
       A();
       int getB();
}

A::A(){

   B b;
   p_b = &b;
}

int A::getB(){

   return p_b->i;

}


<3>
class A{
   pirivate:
       B *p_b;
   public:
       A();
       int getB();
}

A::A(){

   p_b = new B();

}

int A::getB(){

   return p_b->i;

}

コード:

#include <cstdio>
#include <vector>

std::vector<int> *hoge(void) {
	std::vector<int> a;
	a.push_back(346);
	return &a;
}

int main(void) {
	std::vector<int> *a = hoge();
	printf("%d\n", a->at(0));
	return 0;
}