Practice session (Matrix)

(1)

Matrix Sum of Rows and Coloumns
#include<iostream.h>
#include<conio.h>


void sum(int a[][20],int m,int n)
{
int i,j,s=0;
for(i=0;i<m;i++)
{
    s=0;
    for(j=0;j<n;j++)
        s+=a[i][j];
    cout<<"\nSum of"<<i<<"row"<<s;
}
for(i=0;i<m;i++)
{
    s=0;
    for(j=0;j<n;j++)
        s+=a[j][i];
    cout<<"\nSum of"<<i<<"coloumn"<<s;
}
}
void main()
{
int a[10][20],m,n,i,j;
cout<<"Enter the order of matrix";
cin>>m>>n;
cout<<"Enter the Elements";
for(i=0;i<m;i++)
for(j=0;j<n;j++)
cin>>a[i][j];
sum(a,m,n);
getch();
}

(2)

Program to find sum of diagonals in a matrix
#include<iostream.h>
#include<conio.h>
int sod(int a[10][10],int r,int c)
 {
  int i,j,sum=0;
  for(i=0;i<r;i++)
     {
      for(j=0;j<c;j++)
         {
           if(i==j||i+j==r-1)
           sum+=a[i][j];
         }
      }
       return(sum);
 }
void main()
 {
 clrscr();
 int a[10][10],r,c,i,j;
 cout<<"\n";
 cout<<"enter size of row and column ";
 cout<<"\n";
 cin>>r>>c;
 cout<<"\n";
 cout<<"enter elements";
 for(i=0;i<r;i++)
    {
     cout<<"\n";
     for(j=0;j<c;j++)
        {
         cin>>a[i][j];
        }
    }
 cout<<"\n";
 cout<<"sum is"<< sod(a,r,c);
 getch();
 }

(3)

Program for Matrix Multiplication
#include<iostream.h>
#include<conio.h>
void mul(int a[10][10],int b[10][10],int c[20][20],int d,int r,int r1,int c1);
void main()
{
 clrscr();
 int a[10][10],b[10][10],c[20][20],r,d,i,j,r1,c1;
 cout<<"\n";
 cout<<"enter size row and column of matix 1";
 cout<<"\n\n";
 cin>>r;
 cout<<"\n";
 cin>>d;
 cout<<"\n";
 cout<<"enter elements";
 cout<<"\n";
 for(i=0;i<r;i++)
    {
     for(j=0;j<d;j++)
        {
          cout<<"\n";
          cin>>a[i][j];
         }
     }
  cout<<"\n";
  cout<<"enter size of row and column of matix 2";
  cout<<"\n\n";
  cin>>r1;
  cout<<"\n";
  cin>>c1;
  cout<<"\n";
  cout<<"enter elements in matrix 2";
  cout<<"\n";
  for(i=0;i<r1;i++)
     {
      for(j=0;j<c1;j++)
         {
          cout<<"\n";
          cin>>b[i][j];
         }
     }
 mul(a,b,c,d,r,r1,c1);
getch();
}
void mul(int a[10][10],int b[10][10],int c[20][20],int d,int r,int r1,int c1)
  {
   int k,i,j;
   if(d!=r1)
     {
      cout<<"multiplication not possible";
     }
   else
    {
     for(i=0;i<r;i++)
        {

         for(j=0;j<c1;j++)
            {
             for(k=0;k<r1;k++)
                {
                 c[i][j]+=a[i][k]*b[k][j];
                }
             }
          }
     }
  cout<<"\n";
  cout<<"after multiplication"<<"\n\n";
  for(i=0;i<r;i++)
     {
      for(j=0;j<c1;j++)
         {
          cout<<c[i][j]<<"\t";
         }
      }
 }

(4)

Program to display numbers divisible by 10 in a Matrix
#include<iostream.h>
#include<conio.h>
void disp(int m[5][5]);
void main()
{
clrscr();
int m[5][5],i,j;
cout<<"\n\n";
cout<<"enter elements";
cout<<"\n";
for(i=0;i<3;i++)
   {
    for(j=0;j<3;j++)
       {
        cout<<"\n";
        cin>>m[i][j];
       }
    }
disp(m);
getch();
}
void disp(int m[5][5])
{
 int i,j;
 cout<<"\n\n";
 cout<<"nos. divisible by 10 are";
 cout<<"\n\n";
 for(i=0;i<3;i++)
    {
     for(j=0;j<3;j++)
        {
         if(m[i][j]%10==0)
           {
            cout<<m[i][j]<<"\t";
           }
        }
    }
}