120. JAVA Program to find Multiplication of two matrices.
How does this program work?
- In this program we are going to learn about how to find Multiplication of two matrices using java.
- If rows and columns of given two matrices are same then only Multiplication will be possible. It is not possible to multiply a 2 × 3 matrix with a 3 × 2 matrix.
- After that followed by given logic we can get the product of two matrices in matrix format.
Here is the code
//Multiplication of two matrices
import java.util.Scanner;public class MUlMatrix
{
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 does not exist ");
}
}
