multiplymatrix.java

import java.util.Scanner;
class multiplymatrix
{
public static void main(String args[])
{
int r1, r2,c1,c2,i,j,k,sum;
Scanner in = new Scanner(System.in);
System.out.println("Enter the number of rows of matrix1");
r1 = in.nextInt();
System.out.println("Enter the number columns of matrix 1");
c1 = in.nextInt();
System.out.println("Enter the number of rows of matrix2");
r2 = in.nextInt();
System.out.println("Enter the number of columns of matrix 2");
c2 = in.nextInt();
if(c1==r2)
{
int mat1[][] = new int[r1][c1]; 
int mat2[][] = new int[r2][c2]; 
int res[][] = new int[r1][c2];
System.out.println("Enter the elements of matrix1");
for(i=0;i<r1;i++)
{ 
for(j=0;j<c1;j++)
mat1[i][j] = in.nextInt();
}
System.out.println("Enter the elements of matrix2");
for(i=0;i<r2;i++)
{ 
for(j=0;j<c2;j++)
mat2[i][j] = in.nextInt();
}
System.out.println("\n\noutput matrix:-");
for(i=0;i<r1;i++)
for(j=0;j<c2;j++)
{
sum=0;
for(k=0;k<r2;k++)
{
sum +=mat1[i][k]*mat2[k][j] ;
}
res[i][j]=sum;
}
for(i=0;i<r1;i++)
{
for(j=0;j<c2;j++)
System.out.print(res[i][j]+" ");
System.out.println();
}
}
else
System.out.print("multipication not possible ");
}
}