考考你：算术游戏

闲来无事，看看这个算术游戏吧。

正好考考你的算术能力。

有点恶搞。

#include <stdio.h>
#include <windows.h>
using namespace std;
int choice;
void exit();
void level_1();
void level_2();
void level_3();
void level_4();
void level_5();
int main() {
	system("cls");
	MessageBox(NULL, "恭喜你进入了游戏!", "welcome", MB_OK);
	MessageBox(NULL, "现在开始游戏", "start", MB_OK);
	printf("算数游戏\n");
	printf("1.start\n");
	printf("2.exit\n");
	scanf("%d", &choice);
	switch(choice) {
		case 1:
			level_1();
			break;
		case 2:
			exit();
			break;
		default:
			MessageBox(NULL, "退出游戏!", "stop", MB_OK);
	}
	return 0;
}
void exit() {
	system("cls");
	MessageBox(NULL, "确定退出?(1/0)", "exit", MB_OK);
	scanf("%d", &choice);
	switch(choice) {
		case 1:
			MessageBox(NULL, "好的，已退出", "exit", MB_OK);
			break;
		case 2:
			main();
			break;
		default:
			main();
	}
}
void level_1() {
	system("cls");
	MessageBox(NULL, "现在开始第一关", "level_1", MB_OK);
	MessageBox(NULL, "1+1=?", "level_1", MB_OK);
	scanf("%d", &choice);
	while (choice != 2) {
		MessageBox(NULL, "不对!", "level_1", MB_OK);
		scanf("%d", &choice);
	}
	MessageBox(NULL, "答对了!", "level_1", MB_OK);
	level_2();
}
void level_2() {
	system("cls");
	MessageBox(NULL, "现在开始第二关", "level_2", MB_OK);
	MessageBox(NULL, "34+45=?", "level_2", MB_OK);
	scanf("%d", &choice);
	while (choice != 89) {
		MessageBox(NULL, "不对!", "level_2", MB_OK);
		scanf("%d", &choice);
	}
	MessageBox(NULL, "答对了!", "level_2", MB_OK);
	level_3();
}
void level_3() {
	system("cls");
	MessageBox(NULL, "现在开始第三关", "level_3", MB_OK);
	MessageBox(NULL, "3*9=?", "level_3", MB_OK);
	scanf("%d", &choice);
	while (choice != 27) {
		MessageBox(NULL, "不对!", "level_3", MB_OK);
		scanf("%d", &choice);
	}
	MessageBox(NULL, "答对了!", "level_3", MB_OK);
	level_4();
}
void level_4() {
	system("cls");
	MessageBox(NULL, "现在开始第四关", "level_4", MB_OK);
	MessageBox(NULL, "11*15=?", "level_4", MB_OK);
	scanf("%d", &choice);
	while (choice != 165) {
		MessageBox(NULL, "不对!", "level_4", MB_OK);
		scanf("%d", &choice);
	}
	MessageBox(NULL, "答对了!", "level_4", MB_OK);
	level_5();
}
void level_5() {
	system("cls");
	MessageBox(NULL, "现在开始第五关", "level_5", MB_OK);
	MessageBox(NULL, "3.5*2=?", "level_5", MB_OK);
	scanf("%d", &choice);
	while (choice != 7) {
		MessageBox(NULL, "不对!", "level_5", MB_OK);
		scanf("%d", &choice);
	}
	MessageBox(NULL, "答对了!", "level_5", MB_OK);
	main();
}