SUM OF DIAGONAL ELEMENTS OF A SQUARE MATRIX

#include<iostream.h>

#include<conio.h>

int x[10][10], n, i, j, b=0 ;

void inpt(int a[10][10] , int n)

{

  for(i=0 ; i<n ; i++)

    for(j=0 ; j<n ; j++)

      cin>>a[i][j];

  cout<<"the matrix :\n";

  for(i=0 ; i<n ; i++)

  {

    cout<<"\n";

    for(j=0 ; j<n ; j++)

      cout<<a[i][j]<<" ";

  }

  cout<<"\n";

}

void otpt(int a[10][10] , int n)

{

  for(i=0 ; i<n/2 ; i++)

  {

    for(j=0 ; j<n ; j++)

    {

      if(j==i || j==n-1-i)

      b=b+a[i][j];

      else

      continue;

    }

  }

  for(i=n-1 ; i>=(n/2) ; i--)

  {

    for(j=0 ; j<n ; j++)

    {

      if(j==i || j==n-1-i)

      b=b+a[i][j];

      else

      continue;

    }

  }

  cout<<"\nSum of diagonal elements = "<<b;

}

void main()

{

  clrscr();

  cout<<"enter the number of rows or columns : ";

  cin>>n;

  cout<<"enter a matrix : ";

  inpt(x,n);

  otpt(x,n);

  getch();

}

.................................................................

OUTPUT :(click to enlarge the image)

DIAGONAL ELEMENTS IN A SQUARE MATRIX

#include<iostream.h>

#include<conio.h>

int x[10][10], n, i, j;

void inpt(int a[10][10] , int n)

{

  for(i=0 ; i<n ; i++)

    for(j=0 ; j<n ; j++)

      cin>>a[i][j];

  cout<<"The matrix :\n";

  for(i=0 ; i<n ; i++)

  {

    cout<<"\n";

    for(j=0 ; j<n ; j++)

      cout<<a[i][j]<<"  ";

  }

  cout<<"\n";

}

void otpt(int a[10][10] , int n)

{

  for(i=0 ; i<n/2 ; i++)

  {

    for(j=0 ; j<n ; j++)

    {

      if(j==i || j==n-1-i)

      cout<<a[i][j]<<" , ";

    }

  }

  for(i=n-1 ; i>=(n/2) ; i--)

  {

    for(j=0 ; j<n ; j++)

    {

      if(j==i || j==n-1-i)

      {

      cout<<a[i][j];

      if(i==n/2)

        cout<<" .";

      else

        cout<<" , ";

      }

    }

  }

}

void main()

{

  clrscr();

  cout<<"Enter the number of rows or columns : ";

  cin>>n;

  cout<<"Enter a matrix : ";

  inpt(x,n);

  cout<<"Diagonal elements : ";

  otpt(x,n);

  getch();

}

.................................................................

OUTPUT :(click to enlarge the image)

DOUBLE OF A MATRIX

#include<iostream.h>

#include<conio.h>

void main()

{

 int x[10][10], y[10][10], n, m, i, j;

 cout<<"\nEnter the number of rows :";

 cin>>n;

 cout<<"Enter the number of columns :";

 cin>>m;

 cout<<"Enter the matrix X :\n";

 for(i=0 ; i<n ; i++)

 {

   for(j=0 ; j<m ; j++)

     cin>>x[i][j];

 }

 cout<<"The matrix X :\n";

 for(i=0 ; i<n ; i++)

 {

   cout<<"\n";

   for(j=0 ; j<m ; j++)

     cout<<" "<<x[i][j];

 }

 for(i=0 ; i<n ; i++)

 {

   for(j=0 ; j<m ; j++)

     y[i][j]= 2*x[i][j];

 }

 cout<<"\nThe double of the given matrix : ";

 for(i=0 ; i<n ; i++)

 {

   cout<<"\n";

   for(j=0 ; j<m ; j++)

     cout<<" "<<y[i][j];

 }

 getch();

}

.................................................................

OUTPUT:(click to enlarge the image)

SUM OF TWO MATRICES : SIMPLE

#include<iostream.h>

#include<conio.h>

void main()

{

 clrscr();

 int x[10][10], y[10][10], z[10][10] , n, m, i, j;

 char dec;

 cout<<"The number of rows and columns shoud be equal in both the matrices for any \narithmentic operation ";

 do{

    cout<<"\nEnter the number of rows :";

    cin>>n;

    cout<<"Enter the number of columns :";

    cin>>m;

    cout<<"Enter the matrix X :\n";

    for(i=0 ; i<n ; i++)

    {

      for(j=0 ; j<m ; j++)

      cin>>x[i][j];

    }

    cout<<"The matrix X :\n";

    for(i=0 ; i<n ; i++)

    {

      cout<<"\n";

      for(j=0 ; j<m ; j++)

      cout<<" "<<x[i][j];

    }

    cout<<"\nIs the matrix correct? (Y/N) : ";

    cin>>dec;

 }while(dec=='N'|| dec=='n');

do{

   cout<<"\nEnter the matrix Y :\n";

   for(i=0 ; i<n ; i++)

   {

     for(j=0 ; j<m ; j++)

       cin>>y[i][j];

   }

   cout<<"The matrix Y :\n";

   for(i=0 ; i<n ; i++)

   {

     cout<<"\n";

     for(j=0 ; j<m ; j++)

       cout<<" "<<y[i][j];

   }

   cout<<"\nIs the matrix correct? (Y/N) : ";

      cin>>dec;

}while(dec=='N'|| dec=='n');

 for(i=0 ; i<n ; i++)

 {

   for(j=0 ; j<m ; j++)

     z[i][j]= x[i][j] + y[i][j];

 }

 cout<<"\nThe sum of the two given matrices : ";

 for(i=0 ; i<n ; i++)

 {

   cout<<"\n";

   for(j=0 ; j<m ; j++)

     cout<<" "<<z[i][j];

 }

 getch();

}

.................................................................

OUTPUT:(click to enlarge the image)

SUM OF TWO MATRICES : SPECIAL DESIGN

#include<iostream.h>

#include<conio.h>

int n, m , x[3][3], y[3][3], z[3][3], i, j, k, l;

void inpt(int a[3][3] , int n , int m)

{

  for(i=0 ; i<n ; i++)

    for(j=0 ; j<m ; j++)

      cin>>a[i][j];

  cout<<"the matrix :\n";

  for(i=0 ; i<n ; i++)

  {

    cout<<"\n";

    for(j=0 ; j<m ; j++)

      cout<<a[i][j];

  }

  cout<<"\n";

}

void sum(int x[3][3], int y[3][3] , int z[3][3], int n, int m)

{

  for(i=0 ; i<n ; i++)

    for(j=0 ; j<m ; j++)

      z[i][j]= x[i][j] + y[i][j];

}

void otpt(int x[3][3], int y[3][3] , int z[3][3], int n, int m)

{

  for(i=0 ; i<n ; i++)

  {

    if(i==1)

    {

      for(j=1 ; j<=1 ; j++)

      cout<<" "<<x[i][j]<<" +";

      for(k=1 ; k<=1 ; k++)

      cout<<" "<<y[i][k]<<" =";

      for(l=1 ; l<=1 ; l++)

      cout<<" "<<z[i][l];

    }

    else

    {

      for(j=0 ; j<3 ; j++)

      {

      if(j==1)

        continue;

      cout<<x[i][j]<<" ";

      }

      for(k=0 ; k<3 ; k++)

      {

      if(k==1)

        continue;

      cout<<y[i][k]<<" ";

      }

      for(l=0 ; l<3 ; l++)

      {

      if(l==1)

        continue;

      cout<<z[i][l]<<" ";

      }

    }

    cout<<"\n";

  }

}

void main()

{

  clrscr();

  cout<<"Enter the number of rows : ";

  cin>>n;

  cout<<"Enter the number of columns : ";

  cin>>m;

  cout<<"Enter the 1st matrix :\n";

  inpt(x,n,m);

  cout<<"Enter the 2nd matrix :\n";

  inpt(y,n,m);

  sum(x,y,z,n,m);

  cout<<"\nThe sum of the given matrices :\n";

  otpt(x,y,z,n,m);

  getch();

}

.................................................................

OUTPUT:(CLICK TO ENLARGE)