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# corejava-array: How to calculate the product of two matrices in java?

 write a java program to output product of two matrices. corejava x 353array x 12 Posted On : 2014-06-09 06:36:48.0 prince haxor 1930 4 Following is working java code using scanner class to find the product of two matrices. Keep in mind a rule that is only those matrices can be multiplied in which the number of columns of first matrix should be equal to the number of rows of second matrix. If your first matrix is of dimension m x n and second matrix is of dimension p x q, then to multiply these matrices n==p should be true. ******************* Java program to find the multiply/product of two matrices ****************** MatricesMultiplication.java: ---------------------------------------- import java.util.Scanner; class MatricesMultiplication { public static void main(String args[]) { int m, n, p, q, sum = 0, c, d, k; Scanner in = new Scanner(System.in); System.out.println("Enter the number of rows and columns of first matrix separated by white space:"); m = in.nextInt(); n = in.nextInt(); int first[][] = new int[m][n]; System.out.println("Enter the elements of first matrix in the matrix form"); for ( c = 0 ; c < m ; c++ ) for ( d = 0 ; d < n ; d++ ) first[c][d] = in.nextInt(); System.out.println("Enter the number of rows and columns of second matrix separated by white space"); p = in.nextInt(); q = in.nextInt(); if ( n != p ) System.out.println("Sorry! Matrices with entered orders can not be multiplied with each other."); else { int second[][] = new int[p][q]; int multiply[][] = new int[m][q]; System.out.println("Enter the elements of second matrix in the matrix form"); for ( c = 0 ; c < p ; c++ ) for ( d = 0 ; d < q ; d++ ) second[c][d] = in.nextInt(); for ( c = 0 ; c < m ; c++ ) { for ( d = 0 ; d < q ; d++ ) { for ( k = 0 ; k < p ; k++ ) { sum = sum + first[c][k]*second[k][d]; } multiply[c][d] = sum; sum = 0; } } System.out.println("Following is the product of given metrices....."); for ( c = 0 ; c < m ; c++ ) { for ( d = 0 ; d < q ; d++ ) System.out.print(multiply[c][d]+"\t"); System.out.print("\n"); } } } } /***************************************** Output ***************************************/ Posted On : 2014-06-09 16:06:32 Satisfied : 2 Yes  0 No Garima Gupta 596129558962Reply This Thread 5 