Matrix Multiplication

Program to implement Matrix Multiplication :-

#include<iostream>

#include<conio>

int main()

{

rows_columns:

  int a[10][10], b[10][10], mult[10][10], r1, c1, r2, c2, i, j, k;

   cout << "Enter rows and columns for first matrix: ";

  cin >> r1 >> c1;

   cout << "Enter rows and columns for second matrix: ";

  cin >> r2 >> c2;

/* If colum of first matrix in not equal to row of second matrix, asking user to enter the size of matrix again. */

  if(c1!=r2)

   {

      cout << "Error! column of first matrix not equal to row of second.";

      goto rows_columns;

  }

/* Storing elements of first matrix. */

  cout << endl << "Enter elements of matrix 1:" << endl;

   for(i=0; i<r1; ++i)

{

      for(j=0; j<c1; ++j)

    {

      cout << "Enter element a" << (i+1) << (j+1) << " : ";

     cin >> a[i][j];

   }

     }

/* Storing elements of second matrix. */

  cout << endl << "Enter elements of matrix 2:" << endl;

   for(i=0; i<r2; ++i)

    {

      for(j=0; j<c2; ++j)

   {

         cout << "Enter element b" << (i+1) << (j+1) << " : ";

  cin >> b[i][j];

   }

        }

/* Multiplying matrix a and b and storing in array mult. */

  for(i=0; i<r1; ++i)

         {

  for(j=0; j<c2; ++j)

  {

     mult[i][j]=0;

    for(k=0; k<c1; ++k)

  {

      mult[i][j]+=a[i][k]*b[k][j];

}

     }

}

/* Displaying the multiplication of two matrix. */

cout << endl << "Output Matrix: " << endl;

for(i=0; i<r1; ++i)

{

for(j=0; j<c2; ++j)

            {

     cout << " " << mult[i][j];

     if(j==c2-1)

            cout << endl;

  }

        }

   getch();

}