Masermind C++ AI

/*
    Mohammad Mohammad
    CSC 7 Template for Mastermind AI
    December 6th, 2019
 */

//System Libraries
#include <iostream>
#include <cstdlib>
#include <ctime>
#include <string>
#include <iomanip>
using namespace std;

//Function Prototypes
string AI(char,char);
bool eval(string,string,char &,char &);
string set();

int main(int argc, char** argv) {
    //Set the random number seed
    srand(static_cast<unsigned int>(time(0)));

    //Declare variables
    string code,guess;  //code to break, and current guess
    char rr,rw;         //right digit in right place vs. wrong place
    int nGuess;         //number of guesses

    //Initialize Values
    nGuess=0;
    code=set();
    rr=rw=0;
    cout<<"The code is "<<code<<endl;
    //Loop until solved and count to find solution
    do{
       nGuess++;
       guess=AI(rr,rw);
    }while(eval(code,guess,rr,rw));
    //Check evaluation
    cout<<nGuess<<" "<<code<<" "<<guess<<endl;
    guess=AI(rr,rw);
    /*cout<<code<<endl;
    for(int i=0;i<10000;i++){
        guess=AI(0,0);
        eval(code,guess,rr,rw);
        cout<<setw(5)<<code<<setw(5)<<guess
                <<setw(2)<<static_cast<int>(rr)
                <<setw(2)<<static_cast<int>(rw)<<endl;
    }*/

    //Exit the program
    return 0;
}

//string AI(char rr,char rw){

//}

string AI(char rr,char rw){
    //Define helper functions here
    void (*print)(string [],char [],char [],int,int)=
        [] (string g[],char r[],char w[],int nb,int ne){
            for(int i=nb;i<=ne;i++){
                cout<<g[i]<<" "
                    <<static_cast<int>(r[i])<<" "
                    <<static_cast<int>(w[i])<<endl;
            }
    };

    //Save the historical values of guesses and results
    static const int SIZE=10000;//How many guesses to save
    static string aGuess[SIZE]; //Save the guesses
    static char grr[SIZE];      //Save right guess in right spot
    static char grw[SIZE];      //Save right guess in wrong spot
    static int guess=0;         //Increment the guess number
    string sGuess="0000";       //Size the guest string

    //Store the results from the last guess
    grr[guess]=rr;
    grw[guess]=rw;

    //Test the helper function
    if(rr==4)print(aGuess,grr,grw,
            guess-10>0?guess-10:0,guess);

    //Calculate the guess
    int n1000=(guess-guess%1000)/1000;
    int n100=(guess-guess%100)/100-10*n1000;
    int n10=(guess%100-guess%10)/10;
    int n1=guess%10;
    sGuess[0]=n1000+'0';
    sGuess[1]=n100+'0';
    sGuess[2]=n10+'0';
    sGuess[3]=n1+'0';
    aGuess[++guess]=sGuess;//Save the result

    //Return the result
    return sGuess;
}

bool eval(string code,string guess,char &rr,char &rw){
    string check="    ";
    rr=0,rw=0;
    //Check how many are right place
    for(int i=0;i<code.length();i++){
        if(code[i]==guess[i]){
            rr++;
            check[i]='x';
            guess[i]='x';
        }
    }
    //Check how many are wrong place
    for(int j=0;j<code.length();j++){
        for(int i=0;i<code.length();i++){
            if((i!=j)&&(code[i]==guess[j])&&(check[i]==' ')){
                rw++;
                check[i]='x';
                break;
            }
        }
    }

    //Found or not
    if(rr==4)return false;
    return true;
}

string set(){
    string code="0000";
    for(int i=0;i<code.length();i++){
        code[i]=rand()%10+'0';
    }
    return code;
}