C++ game returns 0 automatically [closed] - c++

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Whenever i try to run this game, it automatically returns 0.
The game is a text-based survival game that i coded on Code::Blocks. The compiler is MinGW. I am a semi-knowledgeable programmer. There is no error when compiled.
// This game automatically returns 0 and ends for some reason...
#include <iostream>
#include <cstdlib>
#include <ctime>
#include <string>
using namespace std;
int hunger;
int warmth;
int thirst;
int choice;
// Declares variables for hunger, warmth, thirst, and the users choice
int start()
{
cout<< "You are stuck in a forest, all alone"<< endl;
cout<< "You must maintain your hunger, thirst, and warmth." << endl;
int mainPage();
}
int hunt()
{
srand(time(0));
cout<< "You have chosen hunt!"<< endl;
if ((rand() % 2) == 2){
cout<< "You caught a deer!"<< endl;
hunger = hunger + 1;
}
else{
cout<< "You could not find anything..."<< endl;
}
int mainPage();
}
// The previous function is used for the hunting choice
int wood()
{
cout<< "You have chosen find firewood!"<< endl;
if ((rand() % 2) == 2){
cout<< "You found firewood!"<<endl;
warmth = warmth + 1;
}
else{
cout<< "You could not find any firewood"<< endl;
}
int mainPage();
}
// Wood choice
int water()
{
cout<< "You have chosen find water!"<< endl;
if ((rand() % 2) == 2){
cout<< "You have found a river!"<< endl;
thirst = thirst + 1;
}
else{
cout<< "You could not find anything..."<< endl;
}
int mainPage();
}
// Water choice
int mainPage()
{
warmth = warmth - 1;
hunger = hunger - 1;
thirst = thirst - 1;
// Subtracts one from each variable per turn
if (hunger == 0){
cout<< "You starved!"<< endl;
cout<< "Game over!"<< endl;
return 0;
}
if (thirst == 0){
cout<< "You became dehydrated!"<< endl;
cout<< "Game over!"<< endl;
return 0;
}
if (warmth == 0){
cout<< "You froze!"<< endl;
cout<< "Game over!"<< endl;
return 0;
}
// You die if any of the variables reach zero
cout<< "Your hunger is"<< hunger<< endl;
cout<< "Your warmth is"<< warmth<< endl;
cout<< "Your thirst is"<< thirst<< endl;
cout<< "What would you like to do?"<< endl;
cout<< "1 = hunt, 2 = find firewood, 3 = find water"<< endl;
cin>> choice;
if (choice = 1){
int hunt();
}
if (choice = 2){
int wood();
}
if (choice = 3){
int water();
}
// The main page that takes the users choice as input and also tells you the amount of each variable
}
int main()
{
hunger = 5;
thirst = 5;
warmth = 5;
int start();
}
// the main function

Answer 1

You have several issues with you code. First you are not calling your function correctly. When you have
int start();
in main() it doesn't call the start function but instead declares a function named start that returns an int and takes nothing. Knowing that you main function essential becomes
int main() {}
since you do nothing except set some variables that will never be used. A good compiler with a warnings turned on should have at least told you that you had unused variables.
You are going to have this same issue everywhere else you call a function as you declare a function instead of calling it.
Your second issue will come up after you fix your function calls. You will be using functions before you have defined them. A easy way to fix this is to declare the function prototype of all of your functions before you define/use any of them so the compiler knows that the function is going to exist.
A third issue is you use
srand(time(0));
in the function hunt(). This means that every time you call hunt you will reseed rand. instead of doing that you can put srand(time(0)); in main and then you will only seed rand once per execution of the program.
One last thing I see is none of your functions that are declared to return an int actually return anything. If you declare that a function has a return value then you need to return something from the function. If you do not want to return anything then you can make the return type void which means the function returns nothing.