#include <iostream>
#include <cstring>
#include <windows.h>
#include <conio.h>

using namespace std;

class BigInt
{
private:
    int *numar,lungime_sir;
public:
    BigInt();
    BigInt(BigInt &c);
    BigInt(BigInt &c,int v[],int lg);
    ~BigInt();
    BigInt& operator = (const BigInt&a);
    friend istream & operator >>(istream&is,BigInt &r);
    friend ostream & operator <<(ostream&os,BigInt &r);
    friend BigInt operator + (BigInt a,BigInt b);
    friend BigInt operator - (BigInt a,BigInt b);
    friend BigInt operator * (BigInt a,BigInt b);
    friend int compara(BigInt a, BigInt b);
    friend bool operator > (BigInt a,BigInt b);
    friend bool operator < (BigInt a,BigInt b);
    friend bool par(BigInt a);
};

BigInt::BigInt()
{
    lungime_sir=0;
    numar=NULL;
}

BigInt::BigInt(BigInt &c)
{
    lungime_sir=c.lungime_sir;
    numar=new int[lungime_sir];
    for(int i=0; i<lungime_sir; i++)
        numar[i]=c.numar[i];
}

BigInt::BigInt(BigInt &c,int v[],int lg)
{
    c.lungime_sir=lg;
    c.numar=new int[c.lungime_sir];
    for(int i=0; i<lg; i++)
        c.numar[i]=v[i];
}

BigInt::~BigInt()
{
    delete numar;
}

BigInt& BigInt::operator = (const BigInt&a)
{
    int i;
    lungime_sir=a.lungime_sir;
    numar=new int[lungime_sir];
    for(i=0; i<lungime_sir; i++)
        numar[i]=a.numar[i];
}

istream & operator >>(istream & is,BigInt & r)
{
    char sir[256];
    is.getline(sir,256);
    r.lungime_sir=strlen(sir);
    r.numar=new int[r.lungime_sir];
    for(int i=0; i<strlen(sir); i++)
        r.numar[i]=sir[strlen(sir)-1-i]-48;
    return is;
}

ostream & operator <<(ostream & os,BigInt & r)
{
    for(int i=r.lungime_sir-1; i>=0; i--)
        os<<r.numar[i];
    return os;
}

BigInt operator + (BigInt a,BigInt b)
{
    BigInt c;
    int i, t=0,v[256],lungime_sir;
    lungime_sir=max(a.lungime_sir,b.lungime_sir);
    for(i=0;i<lungime_sir;i++)
    {
        if(a.numar[i]>9 || a.numar[i]<0)
            a.numar[i]=0;
        if(b.numar[i]>9 || b.numar[i]<0)
            b.numar[i]=0;
    }
    for(i=0; i<lungime_sir; ++i)
    {
        v[i]=a.numar[i]+b.numar[i]+t;
        t=v[i]/10;
        v[i]=v[i]%10;
    }
    if(t)
        v[lungime_sir++]=t;
    BigInt(c,v,lungime_sir);
    return c;
}

BigInt operator - (BigInt a,BigInt b)
{
    BigInt c;
    int i, t=0,dif[256],lungime_sir;

    for(i=0; i<256; i++)
        dif[i]=0;

    for(i=0; i<a.lungime_sir; i++)
        dif[i]=a.numar[i];

    for(i=0; i<b.lungime_sir; ++i)
    {
        dif[i]=dif[i]-b.numar[i]+t;
        if(dif[i]<0)
        {
            dif[i]=dif[i]+10;
            t=-1;
        }
        else
            t=0;
    }
    i=a.lungime_sir;
    while(i>1 && dif[i]==0)
        i--;
    lungime_sir=i;
    BigInt(c,dif,lungime_sir);
    return c;
}

BigInt operator * (BigInt a,BigInt b)
{
    BigInt c;
    int i,j,t,v[256],lungime_sir;
    for(i=0; i<256; i++)
        v[i]=0;
    for(i=0; i<a.lungime_sir; ++i)
    {
        t=0;
        for(j=0; j<b.lungime_sir; ++j)
        {
            v[i+j]=v[i+j]+a.numar[i]*b.numar[j]+t;
            t=v[i+j]/10;
            v[i+j]=v[i+j]%10;
        }
        if(t)
            v[i+j]=t;
    }
    lungime_sir=a.lungime_sir+b.lungime_sir;
    if(v[lungime_sir]==0)
        lungime_sir--;
    BigInt(c,v,lungime_sir);
    return c;
}

int compara(BigInt a, BigInt b)
{
    int i;
    if(a.lungime_sir<b.lungime_sir)
        return -1;
    if(b.lungime_sir<a.lungime_sir)
        return 1;
    for(i=0; i<a.lungime_sir; ++i)
        if(a.numar[i]<b.numar[i])
            return -1;
        else if(a.numar[i]>b.numar[i])
            return 1;
    return 0;
}

bool operator > (BigInt a,BigInt b)
{
    return compara(a,b)>0;
}

bool operator < (BigInt a,BigInt b)
{
    return compara(a,b)<0;
}

bool par(BigInt a)
{
    if(a.numar[0]%2)
        return true;
    return false;
}

void menu()
{
    system("cls");
    cout<<"\n\n Clasa Numere Mari \n";
    cout<<"\n\t1. Citire numere \n";
    cout<<"\n\t2. Afisare numere \n";
    cout<<"\n\t3. Suma \n";
    cout<<"\n\t4. Diferenta \n";
    cout<<"\n\t5. Inmultire \n";
    cout<<"\n\t6. Paritate \n";
    cout<<"\n\t7. Comparare \n";
    //cout<<"\n\t8. Copiere \n";
    cout<<"\n\t0. Exit\n";
    //getch();
}

int main()
{
    BigInt a,b,c;
    int op;
    while(1)
    {
        menu();
        cout<<"\n\tOptiunea Dumneavoastra: ";
        //getch();
        cin>>op;
        cin.get();
        switch(op)
        {
        case 0:
            return 0;
        case 1:
            cin>>a>>b;
            //getch();
            break;
        case 2:
            cout<<'\n';
            cout<<a<<' '<<b;
            getch();
            break;
        case 3:
            c=a+b;
            cout<<'\n';
            cout<<c;
            getch();
            break;
        case 4:
            if(a>b)
            {
                c=a-b;
                cout<<'\n';
                cout<<c;
            }
            else
            {
                c=b-a;
                cout<<'\n';
                cout<<'-'<<c;
            }
            getch();
            break;
        case 5:
            c=a*b;
            cout<<'\n';
            cout<<c;
            getch();
            break;
        case 6:
            cout<<'\n';
            if(!par(a))
                cout<<"primul numar este par";
            else
                cout<<"primul numar este impar";
            cout<<'\n';
            if(!par(b))
                cout<<"al doilea numar numar este par";
            else
                cout<<"al doilea numar este impar";
            getch();
            break;
        case 7:
            cout<<'\n';
            if(a > b)
                cout<<"primul numar este mai mare ca al doilea";
            else
            {
                if(a < b)
                    cout<<"al doilea numar este mai mare ca primul";
                else
                    cout<<"numerele sunt egale";
            }
            getch();
            break;
        case 8:
            system("cls");
            cout<<" ----    ---- --------  ------------ ----    ----      ------------    ------    -----------     ------    ------------ --------  ----    ----    ------     \n";
            cout<<" *****   **** ********  ************ ****    ****      ************   ********   ************   ********   ************ ********  *****   ****   ********   \n";
            cout<<" ------  ----   ----    ---          ----    ----      ---           ----------  ---      ---  ----------  ------------   ----    ------  ----  ----------  \n";
            cout<<" ************   ****    ***          ****    ****      ***          ****    **** ************ ****    ****     ****       ****    ************ ****    **** \n";
            cout<<" ------------   ----    ---          ----    ----      ---          ------------ -----------  ------------     ----       ----    ------------ ------------ \n";
            cout<<" ****  ******   ****    ***          ************      ***          ************ ****         ************     ****       ****    ****  ****** ************ \n";
            cout<<" ----   ----- --------  ------------ ------------      ------------ ----    ---- ----         ----    ----     ----     --------  ----   ----- ----    ---- \n";
            cout<<" ****    **** ********  ************ ************      ************ ****    **** ****         ****    ****     ****     ********  ****    **** ****    **** \n";
            getch();
        }
    }
    return 0;
}