Matric multipication

[jnabeel]

#include<stdio.h>
#include<conio.h>
#include<iostream.h>
void main(void)
{
    clrscr();
    int nr,nc,i,j,s;
    int mat1[10][10],mat2[10][10],mat3[10][10];
    cout<<"Enter The Number Of Rows";
    cin>>nr;
    cout<<"Enter The Number Of Column";
    cin>>nc;
    for(i=0;i<nr;i++)
    {
  for(j=0;j<nc;j++)
  {
   cout<<"No. of rows"<<(i+1)<<"No. of column"<<(j+1)<<endl;
   cin>>mat1[i][j];
   }
    }
    cout<<"matrix 2";
    for( i=0;i<nr;i++)
    {
  for( j=0;j<nc;j++)
  {
   cout<<"No. of rows"<<(i+1)<<"No. of column"<<(j+1)<<endl;
   cin>>mat2[i][j];
   }
    }
    for(i=0;i<nr;i++)
    {
  for(j=0;j<nc;j++)
  {
   for(s=0;s<nr;s++)
   {
   mat3[i][j]=mat1[i][j]+(mat2[i][s]*mat2[s][j]);
   cout<<mat3[i][j];
   cout<<"\t";
   }
    //cout<<mat3[i][j];
    cout<<endl;
  }
    }
 getch();
}

[Salem]

Apart from using void main (this is wrong), what's your question?

[~s.o.s~]

Jnabeel, the problem in your case is arising because of faulty logic. You need to place three loops to create a generic matrix multiplier. Read up on matrix multiplications here.

A sample implementation I came up with:

// UNTESTED

#include <iostream>
#include <iomanip>

int main()
{
    using namespace std;

    const int ROWS_FIRST_MATRIX = 3 ;
    const int COLS_SECOND_MATRIX = 3 ;
    const int COLS_FIRST_MATRIX = 3 ;

    int mat1[3][3] = { {1,2,3}, {4,5,6}, {7,8,9} } ;
    int mat2[3][3] = { {1,2,3}, {4,5,6}, {7,8,9} } ;
    int mat3[3][3] = { 0 };

    for (int i = 0; i < ROWS_FIRST_MATRIX; ++i)
    {
        for (int j = 0; j < COLS_SECOND_MATRIX; ++j)
        {
            for (int k = 0; k < COLS_FIRST_MATRIX; ++k)
            {
                mat3[i][j] += mat1 [i][k] * mat2 [k][j] ;
            }
        }
    }

    for (int i = 0; i < ROWS_FIRST_MATRIX; ++i)
    {
        for (int j = 0; j < COLS_SECOND_MATRIX; ++j)
        {
            cout <<  setw (5) << mat3 [i][j];
        }
        cout << endl ;
    }

    getchar ();
    return 0;
}

[jnabeel]

Apart from using void main (this is wrong), what's your question?

it did not give the correct answer