6.matrix multiplication

import java.util.*;
import java.lang.*;
class matmul
{
    public static void main(String args[])
    {
        int i,j,k,l,m,n;
        Scanner t = new Scanner (System.in);
        System.out.println("enter row and column of 1st matrix");
        int r1 = t.nextInt();
        int c1 = t.nextInt();
        System.out.println("enter row and column of 2nd matrix");
        int r2 = t.nextInt();
        int c2 = t.nextInt();
        if(c1==r2)
        {
            int a[][] = new int[r1][c1];
            int b[][] = new int[r2][c2];
            System.out.println("enter elements of 1st matrix");
            for(i=0;i<r1;i++)
            {
                for(j=0;j<c1;j++)
                {
                    a[i][j] = t.nextInt();
                }
            }
            System.out.println("enter elements of 2nd matrix");
            for(i=0;i<r2;i++)
            {
                for(j=0;j<c2;j++)
                {
                    b[i][j] = t.nextInt();
                }
            }
            int c[][] = new int[r1][c1];
            for(i=0;i<r1;i++)
            {
                for(j=0;j<r2;j++)
                {
                c[i][j]=0;
                    for(k=0;k<c1;k++)
                    {
                        c[i][j]=c[i][j]+a[i][k]*b[k][j];
                    }
                }
            }
            System.out.println("multiplication of two matrix is :");
            for(i=0;i<r1;i++)
            {
                for(j=0;j<c1;j++)
                {
                    System.out.print(c[i][j]+"  ");

                }
                System.out.println();
            }
        }
        else
        System.out.println("multiplication not possible");
    }
}