Merge pull request #129 from iamsunil25/matrix_Multiplication

matrix Multiplication in java

Author: SarthakKeshari

Arrays/2D Arrays/matrix_Multiplication.java

@@ -0,0 +1,68 @@
+// Q. matrix multiplication in java ?
+
+import java.util.Scanner;
+
+public class matrix_Multiplication {
+    public static void main(String args[]) {
+
+        int m, n, p, q, sum = 0, c, d, k;
+        Scanner in = new Scanner(System.in);
+
+        System.out.print("Enter Number of Rows and Columns of First Matrix : ");
+        m = in.nextInt(); // enter no. of rows of first matrix
+        n = in.nextInt(); // enter no. of vplumns of first matrix
+
+        int first[][] = new int[m][n];
+
+        System.out.print("Enter First Matrix Elements : ");
+
+        for (c = 0; c < m; c++) {
+            for (d = 0; d < n; d++) {
+                first[c][d] = in.nextInt(); // here we have to enter first matrix's element
+            }
+        }
+
+        System.out.print("Enter Number of Rows and Columns of Second Matrix : ");
+        p = in.nextInt(); // enter no. of vplumns of second matrix
+        q = in.nextInt(); // enter no. of vplumns of second matrix
+
+        if (n != p) {
+            System.out.print("Matrix of the entered order can't be Multiplied..!!");
+        } else {
+            int second[][] = new int[p][q];
+            int multiply[][] = new int[m][q];
+
+            System.out.print("Enter Second Matrix Elements :\n");
+
+            for (c = 0; c < p; c++) {
+                for (d = 0; d < q; d++) {
+                    second[c][d] = in.nextInt(); // here we have to enter second matrix's element
+                }
+            }
+
+            System.out.print("Multiplying both Matrix...\n");
+
+            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; // here sum is the element of multiply matrix and one by one element will be inserted
+                    sum = 0;
+                }
+            }
+
+            System.out.print("Multiplication Successfully performed..!!\n");
+            System.out.print("Now the Matrix Multiplication Result is :\n");
+
+            for (c = 0; c < m; c++) {
+                for (d = 0; d < q; d++) {
+                    System.out.print(multiply[c][d] + "\t"); // multiply matrix output
+                }
+                System.out.print("\n");
+            }
+        }
+
+    }
+}