Coding Question 4 Free Section

June 23, 2019

Matrix Multiplication Program

C

#include <stdio.h>
 
int main()
{
  int m, n, p, q, c, d, k, sum = 0;
  int first[10][10], second[10][10], multiply[10][10];
 
  printf("Enter number of rows and columns of first matrix\n");
  scanf("%d%d", &m, &n);
  printf("Enter elements of first matrix\n");
 
  for (c = 0; c < m; c++)
    for (d = 0; d < n; d++)
      scanf("%d", &first[c][d]);
 
  printf("Enter number of rows and columns of second matrix\n");
  scanf("%d%d", &p, &q);
 
  if (n != p)
    printf("The matrices can't be multiplied with each other.\n");
  else
  {
    printf("Enter elements of second matrix\n");
 
    for (c = 0; c < p; c++)
      for (d = 0; d < q; d++)
        scanf("%d", &second[c][d]);
 
    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;
      }
    }
 
    printf("Product of the matrices:\n");
 
    for (c = 0; c < m; c++) {
      for (d = 0; d < q; d++)
        printf("%d\t", multiply[c][d]);
 
      printf("\n");
    }
  }
 
  return 0;
}

Java

public class MultiplyMatrices {

    public static void main(String[] args) {
        int r1 = 2, c1 = 3;
        int r2 = 3, c2 = 2;
        int[][] firstMatrix = { {3, -2, 5}, {3, 0, 4} };
        int[][] secondMatrix = { {2, 3}, {-9, 0}, {0, 4} };

        // Mutliplying Two matrices
        int[][] product = new int[r1][c2];
        for(int i = 0; i < r1; i++) {
            for (int j = 0; j < c2; j++) {
                for (int k = 0; k < c1; k++) {
                    product[i][j] += firstMatrix[i][k] * secondMatrix[k][j];
                }
            }
        }

        // Displaying the result
        System.out.println("Sum of two matrices is: ");
        for(int[] row : product) {
            for (int column : row) {
                System.out.print(column + "    ");
            }
            System.out.println();
        }
    }
}

One comment on “Coding Question 4 Free Section”


  • Shubhrajit Dey

    import java.util.*;
    public class MatrixMultiplication{
    static void matrixmul(int A[][],int B[][],int C[][],int r1,int c1,int r2,int c2){
    for(int i=0;i<r1;i++){
    for(int j=0;j<c2;j++){
    for(int k=0;k<c1;k++){
    C[i][j]+=A[i][k]*B[k][j];
    }
    }
    }
    }
    public static void main(String args[]){
    Scanner sc=new Scanner(System.in);
    System.out.println("Enter r1 & c1 for A matrix :");
    int r1=sc.nextInt();
    int c1=sc.nextInt();
    System.out.println("Enter r2 & c2 for B matrix :");
    int r2=sc.nextInt();
    int c2=sc.nextInt();
    int A[][]=new int[r1][c1];
    int B[][]=new int[r2][c2];
    int C[][]=new int[r1][c2];
    if(c1==r2){
    System.out.println("Enter the element of A matrix");
    for(int i=0;i<r1;i++){
    for(int j=0;j<c1;j++){
    A[i][j]=sc.nextInt();
    }
    }
    System.out.println("Enter the element of B matrix");
    for(int i=0;i<r2;i++){
    for(int j=0;j<c2;j++){
    B[i][j]=sc.nextInt();
    }
    }
    matrixmul(A,B,C,r1,c1,r2,c2);
    System.out.println("The result of matrix multiplicAation is :");
    for(int i=0;i<r1;i++){
    for(int j=0;j<c2;j++){
    System.out.printf("%4d",C[i][j]);
    }
    System.out.println();
    }
    }
    else{
    System.out.println("Multiplication not possible");
    }

    }
    }