Thread: nim game

Code:

#include<iostream>
#include<ctime>

using namespace std;
int pile = 20;
int humanMarbles;
void gameStart();
bool evaluate(int x);

int main()
{
    gameStart();
    cout << "Pile is set to " << pile << endl;
    cout << "Your turn";
    cin >> humanMarbles;
    if (evaluate(humanMarbles) == true);
    {
        pile = pile - humanMarbles;
        cout << "Pile is set to " << pile;
    }
  
    //system("pause");
    return 0;
}

void gameStart()
{
     //system("cls");
     cout << "This is a Nim Game implementation \n" 
             "--------------------------------- \n"
             "you play against the computer taking turns removing marbles from a marble pile \n"
             "you may take 1 up to pile/2. The one who takes the last marble loses \n";
     cout << endl << endl;        
     //srand(static_cast<unsigned int>(time(0)));
     //pile = rand() % 100 + 1;
     return;                 
}

bool evaluate(int x)
{
     bool check;
     if (x <= pile/2 && x>=1)
     {
        check = true;
     }
     else
     {
         cout << "Cannot take marbles";
         check = false;
     }    
     
     return check;
}

I am trying to implement a nim game where the computer and a player take turns in removing marbles from a pile, the last one to take a marble loses. I came across this problem. I am using an evaluate fuction to determine whether the user inputs a number inside the desired interval(1,pile/2). I does not work correctly though. The program will subtract the marble inputed by the user whether it is inside the interval or not.

Also the lines highlighted as comment cause a compiler error in a platform different than dev c++. Implicit declaration of fiction...What is that about?!

>> The program will subtract the marble inputed by the user whether it is inside the interval or not.
You have a small typo. Look again at the if statement. Consider turning up the warning level on your compiler and it might wanr you about this problem.

>> Also the lines highlighted as comment cause a compiler error in a platform different than dev c++.
You need to #include <cstdlib> for srand and rand.

Care to elaborate on the if statement problem?

$&#37;^@#$%& I cant believe I typed a semicolon after an if statement !!!! It was the only place I did not look for a mistake.