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#include <iostream>
#include <stdlib.h>
#include <time.h>
using namespace std;
void Start();
void GetResults();
int i, j, life, maxrand;
char c;
void Start() {
	i = 0;
	j = 0;
	life = 0;
	maxrand = 6;
	cout << "Select difficulty mode:\n";// the user has to select a difficutly level
	cout << "1 : Easy (0-15)\n";
	cout << "2 : Medium (0-30)\n";
	cout << "3 : Difficult (0-50)\n";
	cout << "or type another key to quit\n";
	c = 30;

	cin >> c;                   // read the user's choice
	cout << "\n";

	switch (c) {
		case '1':
			maxrand = 15;  // the random number will be between 0 and maxrand
			break;
		case '2':
			maxrand = 30;
			break;
		case '3':
			maxrand = 50;
			break;
		default:
			exit(0);
		break;
	}

	life = 5;         // number of lifes of the player
	srand((unsigned)time(NULL)); // init Rand() function
	j = rand() % maxrand;  // j get a random value between 0 and maxrand
	
	GetResults();
}

void GetResults() {
	if (life <= 0) { // if player has no more life then he loses
		cout << "You lose !\n\n";
		Start();
	}

	cout << "Type a number: \n";
	cin >> i;
	
	if((i>maxrand) || (i<0)) { // if the user number isn't correct, restart
		cout << "Error: number not between 0 and \n" << maxrand;
		GetResults();
	}

	if(i == j) {
		cout << "YOU WIN!\n\n"; // the user found the secret number
		Start();
	} else if(i>j) {
		cout << "Too BIG\n";
		life = life - 1;
		cout << "Lives remaining: " << life << "\n\n";
		GetResults();
	} else if(i<j) {
		cout << "Too SMALL\n";
		life = life - 1;
		cout << "Lives remaining: " << life << "\n\n";
		GetResults();
	}
}

int main() {
	cout << "** Jackpot game **\n";
	cout << "The goal of this game is to guess a number.\n";
	cout << "Jackpot will tell you if the number is too big or too\n";
	cout << "喵all compared to the secret number to find.\n\n";
	Start();
	return 0;
}

这段代码刚刚使用因为注释的，现在讲人话

#include <iostream>
#include <stdlib.h>
#include <time.h>//头文件 
using namespace std;
void Start();//可以把它想象成function函数 
void GetResults();
int i, j, life, maxrand;
char c;
/*对应第五行 void Start()；*/void Start() {
	i = 0;
	j = 0;
	life = 0;
	maxrand = 6;
	
	cout << "Select difficulty mode:\n"; //用户的难度等级 
	cout << "1 : Easy (0-15)\n";//等级一：0-15（数字范围） 下同 
	cout << "2 : Medium (0-30)\n";//2:0-30
	cout << "3 : Difficult (0-50)\n";//3:0-15
	cout << "or type another key to quit\n";//或输入其他键退出
	c = 30;

	cin >> c;                   // read the user's choice
	cout << "\n";

	switch (c) {//判断所输入的数字范围 
		case '1':
			maxrand = 15;  
			break;
		case '2':
			maxrand = 30;
			break;
		case '3':
			maxrand/* 这是变量*/ = 50;
			break;
		default:
			exit(0);//退出 
		break;//停止 
	}

	life = 5;  
	srand((unsigned)time(NULL)); // init Rand() function（函数） 
	j = rand() % maxrand; 
	
	GetResults();//调用函数 
}

void GetResults() {
	if (life <= 0) { // life是玩家的生命值，一共有life次 
		cout << "You lose !\n\n";
		Start();//调用函数 
	}

	cout << "Type a number: \n";
	cin >> i;
	
	if((i>maxrand) || (i<0)) { //如果数字不在范围内 
		cout << "Error: number not between 0 and \n" << maxrand;
		GetResults();
	}

	if(i == j) {
		cout << "YOU WIN!\n\n"; // 猜对了数字 
		Start();
	} else if(i>j) {
		cout << "Too BIG\n";//数字大了 
		life = life - 1;
		cout << "Lives remaining: " << life << "\n\n";
		GetResults();
	} else if(i<j) {//数字小了 
		cout << "Too SMALL\n";
		life = life - 1;
		cout << "Lives remaining: " << life << "\n\n";
		GetResults();
	}
}

int main() {
	cout << "** Jackpot game **\n";
	cout << "The goal of this game is to guess a number.\n";
	cout << "Jackpot will tell you if the number is too big or too\n";
	cout << "喵all compared to the secret number to find.\n\n";
	Start();
	return 0;
}

你懂了吗？