Tic Tac Toe

C++ program to create game of Tic-Tac-Toe ( X-0 game).

#include<iostream>

#include<conio.h>

using namespace std;

int grid[9]={49,50,51,52,53,54,55,56,57},turn=1,gp=-1,total=0;

int board()

{

      clrscr();

      std::cout<<"\n\t\t\tTic Tac Toe\n\n";

std::cout<< "\t"<<(char)grid[0]<<"  |  "<<(char)grid[1]<<"  |  "<<(char)grid[2]<<endl;

std::cout<<"\t"<<"----------------"<< "\n";

std::cout<<"\t"<<(char)grid[3]<<"  |  "<<(char)grid[4]<<"  |  "<<(char)grid[5]<<endl;

std::cout <<"\t"<<"----------------"<< "\n";

std::cout<< "\t"<<(char)grid[6]<<"  |  "<<(char)grid[7]<<"  |  "<<(char)grid[8]<<endl;

return 0;

}

int input()

{

int option,mark;

if (turn)

{

cout<<"PLAYER 1 ";

mark=88;

turn=0;

}

else

{

cout<<"PLAYER 2 ";

mark=79;

turn=1;

}

inp:

cout<<"Enter number grid number :";

cin>>option;

switch (option) {

case 1:

if(grid[0]==88 || grid[0]==79)

goto inp;

grid[0]=mark; break;

case 2:

if(grid[1]==88 || grid[1]==79)

goto inp;

grid[1]=mark; break;

case 3:

if(grid[2]==88 || grid[2]==79)

goto inp;

grid[2]=mark; break;

case 4:

if(grid[3]==88 || grid[3]==79)

goto inp;

grid[3]=mark; break;

case 5:

if(grid[4]==88 || grid[4]==79)

goto inp;

grid[4]=mark; break;

case 6:

if(grid[5]==88 || grid[5]==79)

goto inp;

grid[5]=mark; break;

case 7:

if(grid[6]==88 || grid[6]==79)

goto inp;

grid[6]=mark; break;

case 8:

if(grid[7]==88 || grid[7]==79)

goto inp;

grid[7]=mark; break;

case 9:

if(grid[8]==88 || grid[8]==79)

goto inp;

grid[8]=mark; break;

default:

goto inp;

}

total++;

return(0);

}

int check()

{

if((grid[0]==grid[1]&&grid[1]==grid[2]) || (grid[3]==grid[4]&&grid[4]==grid[5]) || (grid[6]==grid[7]&&grid[7]==grid[8]))

{

cout<<(char)grid[0]<<" WON THE GAME";

return(1);

}

else if((grid[0]==grid[3]&&grid[3]==grid[6]) || (grid[1]==grid[4]&&grid[4]==grid[7]) || (grid[2]==grid[5]&&grid[5]==grid[8]))

{

cout<<(char)grid[0]<<" WON THE GAME";

return(1);

}

else if((grid[0]==grid[4]&&grid[4]==grid[8]) || (grid[2]==grid[4]&&grid[4]==grid[6]))

{

cout<<(char)grid[0]<<" WON THE GAME ";

return(1);

}

if(total==9)

{

cout<<"GAME DRAWN";

return(0);

}

return(-1);

}

int main()

{

while(check()<0)

{

board();

input();

}

  }

Common Multiple

C++ program to find the n^th common multiple of two given numbers.

#include <iostream>

#include <conio.h>

using namespace std;

int main()

  {

    int a,b,n=0,num;

    std::cout << "Enter two numbers to find common multiple : "<< "\n";

    std::cin>>a>>b;

    std::cout<<"Enter the the common multiple required : ";

    std::cin>>num;

    for (size_t i = 4; ; i++)

    {

      if(i%a==0 && i%b==0)

          n++;

      if (n==num) {

        std::cout<<i;

        break;

      }

    }

    getch();

    return 0;

  }

Matrix

C++ program to find the sum of diagonals of a matrix.

#include<iostream>

#include<conio.h>

#include<vector>

using namespace std;

std::vector<vector<int>> matrix;

int r;

int getarray()

  {

    cout<<"Enter the number of rows and colums of array : ";

    cin>>r;

    for (int i = 0; i < r; i++)

    {

      std::vector<int> row;

      for (int j = 0; j < r; j++)

      {

        int value;

        std::cout <<"enter row "<<i+1<<" element "<<j+1<<endl;

        std::cin >>value;

        row.push_back(value);

      }

      matrix.push_back(row);

    }

    return 0;

  }

int showarray()

  {

    for (int i = 0; i < r; i++) {

        for (int j = 0; j < r; j++) {

          std::cout <<matrix[i][j]<<'\t';

          }

        std::cout << '\n';

      }

    return 0;

  }

int diagsum()

  {

      int sum1=0,sum2=0;

      for(int i=0;i<r;i++)

        {

          sum1+=matrix[i][i];

          sum2+=matrix[i][(r-1)-i];

        }

    std::cout<<"\n\nSum of 1st diagonal : "<<sum1;

    std::cout<<"\nSum of 2nd diagonal : "<<sum2;

    return 0;

  }

int main()

  {

    std::cout << "Enter the array :" << '\n';

    getarray();

    std::cout << "\n\nThe array is :\n\n" << '\n';

    showarray();

    diagsum();

    getch();

    return 0;

  }