Game exp and level up - c++

Question

I've been making my C++ text game. Gone fairly well so far. I had a few delays with some mistakes I have made. Got most of that fixed up. Now I am working on the level up and experience points system. And IDK how to keep that number updated so it's knowns that it reaches level 55. Here's the code:
(first program ever)
//#include <windows.h>
#include <cstdlib>
#include <ctime>
#include <iostream>
#include <string.h>
using namespace std;
bool gameRunning = true;
char Yarra = 'P';
char Dragon = 'D';
char map[28];
class Player;
class Enemy {
private:
int lvl;
public:
int health;
Enemy() {
int randomNumber = rand();
int enemy_life = (randomNumber % 7) + 2;
health = enemy_life;
lvl = 1;
}
void attack(Player& p);
friend class Player;
};
class Final_dragon {
public:
int lvl;
int health;
Final_dragon() {
health = 10;
lvl = 2;
}
void attack(Player& p);
friend class Player;
};
class Player {
private:
public:
int health;
int exp;
int lvl;
Player(bool hero) {
if(hero) {
health = 100;
lvl = 1;
exp = 0;
} else {
health = 1;
}
}
void attack(Enemy& e);
void lvlUp(Player& p);
friend class Enemy;
friend class Final_boss;
};
void Player::attack(Enemy& e) {
int randomNumber = rand();
int dmg = (randomNumber % 2) + 0;
cout << "\nYou've done " << dmg << " damage!" << endl;
e.health -= dmg;
}
void Enemy::attack(Player& p) {
// int randomNumber = rand();
// int dmg = (randomNumber % 20) + 0;
int dmg = 2;
cout << "\nThe Enemy does " << dmg << " damage to you!\n" << endl;
p.health -= dmg;
}
void Player::lvlUp(Player& p) {}
int main() {
int display;
char playerInput{};
char move;
char action;
map[0] = Yarra;
map[27] = Dragon;
cout << "Map: " << map[0];
for(display = 1; display < 27; display++) {
map[display] = '*';
cout << map[display];
}
cout << map[27];
cout << endl
<< endl
<< "Press '1' Travel to another space on the board \n"
<< "Press '2' Dismount and explore the current space " << endl;
display = 0; // Start at map[0]
while(gameRunning == true) {
Player p(true);
do {
cin >> move; // Get user input
if(move == '1') // If input is '1'
{
srand(time(0));
int dice = (int)(1 + rand() % 6);
cout << "You moved: " << dice << " steps" << endl;
map[display] = '*'; // Remove old location of player
display = display + dice; // Increase display location
map[display] = 'P'; // Insert player in new map array location
cout << "Your current location: " << display
<< endl; // Player current location
}
if(move == '2') // If input is '2'
{
cout << "Your current location: " << display
<< endl; // Player current location
srand(time(0));
int monster_dice = (int)(1 + rand() % 14); // Random monster
cout << "Monster location: " << monster_dice << endl
<< endl; // monster location
if(display == monster_dice) {
cout << "You've encountered a Enemy! Press \"a\" to attack"
<< endl
<< endl;
Enemy e;
cout << "HP of the monster you encounter: " << e.health << endl;
cin >> action;
if(action == 'a' || action == 'A') {
do {
p.attack(e);
cin.ignore(1);
if(p.health <= 0) {
system("CLS");
cout << "\t\n\nYou have died..." << endl;
cout << "\t\nGAME OVER!" << endl << endl;
return 0;
}
if(e.health >= 1) {
e.attack(p);
cin.ignore(1);
}
} while(e.health >= 0);
if(e.health <= 0) {
cout << "\n\nYou defeat the Enemy! *Vistory Music*\n"
<< endl;
cout << "You gained " << 100
<< " experience from the Boar." << endl;
p.exp += 100;
}
if(p.exp >= 200 && p.exp <= 300) {
cout << "\nYou've gone up to level 2!" << endl;
p.lvl++;
p.health += 50;
}
if(p.exp >= 300 && p.exp <= 400) {
cout << "\nYou've gone up to level 3!" << endl;
p.lvl++;
p.health += 40;
}
if(p.exp >= 400 && p.exp <= 500) {
cout << "\nYou've gone up to level 4!" << endl;
p.lvl++;
p.health += 50;
}
if(p.exp >= 600 && p.exp <= 700) {
cout << "\nYou've gone up to level 5!" << endl;
p.lvl++;
p.health += 50;
}
}
}
}
} while(move != '1');
for(int x = 0; x <= 28; x++) {
cout << map[x];
}
if(display == 27 || display > 27) // If player at end of map array, end game
{
Final_dragon d;
if(p.lvl == 2) {
cout << "Ready for the fight" << endl;
} else {
system("CLS");
cout << "\nAlas, the dragons eyes stare at you and places you "
"under his spell. You try to move but fail to do so and "
"find yourself torched by the dragons fire.If only you had "
"more experience, you could have seen it coming."
<< endl;
cout << "\t\nGAME OVER!" << endl
<< endl; // Show text explaining why game ended
}
}
}
}

Answer 1

while(gameRunning == true) {
Player p(true);
You create a new hero player in each iteration. All experience and levels gained will be reset back to a newly created Player.
Create the Player before the loop:
Player p(true);
while(gameRunning == true) {
If you want the player to be able to fight the dragon if he/she is at least at the same level as the dragon, change the condition from if(p.lvl == 2) to if(p.lvl >= d.lvl).
You should seed the pseudo random number generator, i.e., call srand(), only once during the programs execution. Call it once when the program starts and never again.
If you are using C++11 or newer, you should use the <random> library instead of srand() and rand(). The same rule applies for those modern generators. Only seed them once.
A function to create a random number could look like this:
#include <random>
// A function to return a random number generator.
inline std::mt19937& generator() {
// the generator will only be seeded once since it's static
static std::mt19937 gen(std::random_device{}());
return gen;
}
// A function to generate int:s in the range [min, max]
int my_rand(int min, int max) {
std::uniform_int_distribution<int> dist(min, max);
return dist(generator());
}