C++ code for 4-bit Binary to Decimal conversion

#include<iostream>
using namespace std;
void main()
{
int x;
cout<<"Enter any 4 bit binary number\n";
cin>>x;
int i1,i2,i3,i4,c1,c2;
i1=x/1000;
c1=x%1000;
i2=c1/100;
c2=c1%100;
i3=c2/10;
i4=c2%10;

if((i1==0 || i1==1)&&(i2==0 || i2==1)&&(i3==0 || i3==1)&&(i4==0 || i4==1))
{
int answer=(i1*8)+(i2*4)+(i3*2)+(i4*1);
cout<<x<<" in Decimal, Equals to: "<<answer<<endl;
}
else
cout<<"Error* Wrong input\nEnter Binary values (0 or 1)\n";
}

C++ Code for My Grand-maa trunk Game

#include <iostream>
#include<string>
void input(char[]);
void arrconca(char[],char[]);
void output(char[]);
#include<windows.h>
int i=0;
using namespace std;
void main()
{
system("color 3");
char array[5000]={"In my Grandmaa trunk, I packed "};
char array1[20]={'\0'};
for(i=0;i<10;i++)
{
cout<<"Player "<<i<<":";
input(array1);
arrconca(array,array1);
output(array);
cout<<"\n";
}
}
void input(char array1[])
{
cin.getline(array1,20,'\n');
}
void arrconca(char array[],char array1[])
{
system("color 4");
char temp[11]={" and the "};
if(i==0)
strcat(array,array1);
if(i!=0)
{
strcat(array,temp);
strcat(array,array1);
}
}
void output(char array[])
{
system("color 2");
int y=strlen(array);
for(int i=0;i<y;i++)
cout<<array[i];
}

C++ code for Tic Tak Toe

#include<iostream>
#include<windows.h>
using namespace std;
void main()
{
int rep=0;
do
{
system("color f0");
int c=1;
char game[3][3]={'7','8','9','4','5','6','1','2','3'};
int num;
char player1='\0',player2='\0';
int check;
cout<<"Please press caps on to Start game\n";
int y=rand()%100;
if(y%2==0)
{
cout<<"Player 1 select your option \'X\' or \'O\'\n";
cin>>player1;
check=1;
if(player1=='O')
player2='X';
if(player1=='X')
player2='O';
cout<<"Player 1:"<<player1<<" Player 2:"<<player2<<"\n";
}
if(y%2!=0)
{
cout<<"Player 2 select your option \'X\' or \'O\'\n";
cin>>player2;
check=2;
if(player2=='O')
player1='X';
if(player2=='X')
player1='O';
cout<<"Player 1:"<<player1<<" Player 2:"<<player2<<"\n";
}
system("pause");
system("cls");
cout<<"Game started\n\n";
int k=1;
do
{
if(check==1)
{
for(int i=0;i<3;i++)
{
for(int j=0;j<3;j++)
{
cout<<game[i][j]<<"\t";
}
cout<<"\n\n";
}
system("color f8");
cout<<"\nPlayer 1:"<<player1<<"\nPress number 1-9 as on standerd keyboard:";
cin>>num;
if(num==1 && game[2][0]!='X' && game[2][0]!='O')
{
game[2][0]=player1;
check=2;
k++;
}
if(num==2 && game[2][1]!='X' && game[2][1]!='O')
{
game[2][1]=player1;
check=2;
k++;
}
if(num==3 && game[2][2]!='X' && game[2][2]!='O')
{
game[2][2]=player1;
check=2;
k++;
}
if(num==4 && game[1][0]!='X' && game[1][0]!='O')
{
game[1][0]=player1;
check=2;
k++;
}
if(num==5 && game[1][1]!='X' && game[1][1]!='O')
{
game[1][1]=player1;
check=2;
k++;
}
if(num==6 && game[1][2]!='X' && game[1][2]!='O')
{
game[1][2]=player1;
check=2;
k++;
}
if(num==7 && game[0][0]!='X' && game[0][0]!='O')
{
game[0][0]=player1;
check=2;
k++;
}
if(num==8 && game[0][1]!='X' && game[0][1]!='O')
{
game[0][1]=player1;
check=2;
k++;
}
if(num==9 && game[0][2]!='X' && game[0][2]!='O')
{
game[0][2]=player1;
check=2;
k++;
}
if((game[0][0]==player1)&&(game[0][1]==player1)&&(game[0][2]==player1))
{
num=0;
k=9;
cout<<"\n\n\t\t\t"<<(char)1<<" Player1 Wins \a"<<(char)1<<"\n";
check=0;
system("pause");
}
else if((game[1][0]==player1)&&(game[1][1]==player1)&&(game[1][2]==player1))
{
cout<<"\n\n\t\t\t"<<(char)1<<" Player1 Wins\a "<<(char)1<<"\n";
check=0;
k=9;
num=0;
system("pause");
}
else if((game[2][0]==player1)&&(game[2][1]==player1)&&(game[2][2]==player1))
{
cout<<"\n\n\t\t\t"<<(char)1<<" Player1 Wins \a"<<(char)1<<"\n";
check=0;
k=9;
num=0;
system("pause");
}
else if((game[0][0]==player1)&&(game[1][0]==player1)&&(game[2][0]==player1))
{
cout<<"\n\n\t\t\t"<<(char)1<<" Player1 Wins \a"<<(char)1<<"\n";
check=0;
k=9;
num=0;
system("pause");
}
else if((game[0][1]==player1)&&(game[1][1]==player1)&&(game[2][1]==player1))
{
cout<<"\n\n\t\t\t"<<(char)1<<" Player1 Wins \a"<<(char)1<<"\n";
check=0;
k=9;
num=0;
system("pause");
}
else if((game[0][2]==player1)&&(game[1][2]==player1)&&(game[2][2]==player1))
{
cout<<"\n\n\t\t\t"<<(char)1<<" Player1 Wins\a "<<(char)1<<"\n";
check=0;
k=9;
num=0;
system("pause");
}
else if((game[0][0]==player1)&&(game[1][1]==player1)&&(game[2][2]==player1))
{
cout<<"\n\n\t\t\t"<<(char)1<<" Player1 Wins\a "<<(char)1<<"\n";
check=0;
k=9;
num=0;
system("pause");
}
else if((game[0][2]==player1)&&(game[1][1]==player1)&&(game[2][0]==player1))
{
cout<<"\n\n\t\t\t"<<(char)1<<" Player1 Wins \a"<<(char)1<<"\n";
check=0;
k=9;
num=0;
system("pause");
}
}
system("cls");
if(check==2)
{
for(int i=0;i<3;i++)
{
for(int j=0;j<3;j++)
{
cout<<game[i][j]<<"\t";
}
cout<<"\n\n";
}
system("color f4");
cout<<"\nPlayer 2:"<<player2<<"\nPress number 1-9 as on standerd keyboard:";
cin>>num;
if(num==1 && game[2][0]!='X' && game[2][0]!='O')
{
game[2][0]=player2;
check=1;
k++;
}
if(num==2 && game[2][1]!='X' && game[2][1]!='O')
{
game[2][1]=player2;
check=1;
k++;
}
if(num==3 && game[2][2]!='X' && game[2][2]!='O')
{
game[2][2]=player2;
check=1;
k++;
}
if(num==4 && game[1][0]!='X' && game[1][0]!='O')
{
game[1][0]=player2;
check=1;
k++;
}
if(num==5 && game[1][1]!='X' && game[1][1]!='O')
{
game[1][1]=player2;
check=1;
k++;
}
if(num==6 && game[1][2]!='X' && game[1][2]!='O')
{
game[1][2]=player2;
check=1;
k++;
}
if(num==7 && game[0][0]!='X' && game[0][0]!='O')
{
game[0][0]=player2;
check=1;
k++;
}
if(num==8 && game[0][1]!='X' && game[0][1]!='O')
{
game[0][1]=player2;
check=1;
k++;
}
if(num==9 && game[0][2]!='X' && game[0][2]!='O')
{
game[0][2]=player2;
check=1;
k++;
}
if((game[0][0]==player2)&&(game[0][1]==player2)&&(game[0][2]==player2))
{
cout<<"\n\n\t\t\t"<<(char)1<<" Player2 Wins \a"<<(char)1<<"\n";
check=0;
k=9;
num=0;
system("pause");
}
if((game[1][0]==player2)&&(game[1][1]==player2)&&(game[1][2]==player2))
{
cout<<"\n\n\t\t\t"<<(char)1<<" Player2 Wins \a"<<(char)1<<"\n";
check=0;
k=9;
num=0;
system("pause");
}
if((game[2][0]==player2)&&(game[2][1]==player2)&&(game[2][2]==player2))
{
cout<<"\n\n\t\t\t"<<(char)1<<" Player2 Wins\a "<<(char)1<<"\n";
check=0;
k=9;
num=0;
system("pause");
}
if((game[0][0]==player2)&&(game[1][0]==player2)&&(game[2][0]==player2))
{
cout<<"\n\n\t\t\t"<<(char)1<<" Player2 Wins \a"<<(char)1<<"\n";
check=0;
k=9;
num=0;
system("pause");
}
if((game[0][1]==player2)&&(game[1][1]==player2)&&(game[2][1]==player2))
{
cout<<"\n\n\t\t\t"<<(char)1<<" Player2 Wins \a"<<(char)1<<"\n";
check=0;
k=9;
num=0;
system("pause");
}
if((game[0][2]==player2)&&(game[1][2]==player2)&&(game[2][2]==player2))
{
cout<<"\n\n\t\t\t"<<(char)1<<" Player2 Wins\a "<<(char)1<<"\n";
check=0;
k=9;
num=0;
system("pause");
}
if((game[0][0]==player2)&&(game[1][1]==player2)&&(game[2][2]==player2))
{
cout<<"\n\n\t\t\t"<<(char)1<<" Player2 Wins \a"<<(char)1<<"\n";
check=0;
k=9;
num=0;
system("pause");
}
if((game[0][2]==player2)&&(game[1][1]==player2)&&(game[2][0]==player2))
{
cout<<"\n\n\t\t\t"<<(char)1<<" Player2 Wins \a"<<(char)1<<"\n";
check=0;
      k=9;
num=0;
system("pause");
}
}

system("cls");
 }while(k<9);
            cout<<"Press 1 to Rematch\nPress 2 to Terminate:";
       cin>>rep;
     }while(rep==1);
}