Computer Science
Write a program in Java to store the elements in two different double dimensional arrays (in matrix form) A and B each of order 4 x 4. Find the product of both the matrices and store the result in matrix C. Display the elements of matrix C.
Note:
Two matrixes can be multiplied only if the number of columns of the first matrix must be equal to the number of rows of the second matrix.
Sample Input: Matrix A
3 | 2 | 1 | 2 |
6 | 4 | 5 | 0 |
7 | -1 | 0 | 2 |
4 | 3 | 1 | 1 |
Sample Input: Matrix B
-2 | -4 | -1 | 0 |
3 | 6 | -5 | 2 |
5 | 3 | 4 | 6 |
0 | -2 | 2 | 5 |
Sample Output: Matrix C
5 | -1 | -5 | 20 |
25 | 15 | -6 | 38 |
-17 | -38 | 2 | -8 |
6 | 3 | -13 | 17 |
Java
Java Arrays
16 Likes
Answer
import java.util.Scanner;
public class KboatDDAMultiply
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
int a[][] = new int[4][4];
int b[][] = new int[4][4];
int c[][] = new int[4][4];
System.out.println("Enter elements of Matrix A");
for (int i = 0; i < 4; i++) {
System.out.println("Enter Row "+ (i+1) + " :");
for (int j = 0; j < 4; j++) {
a[i][j] = in.nextInt();
}
}
System.out.println("Enter elements of Matrix B");
for (int i = 0; i < 4; i++) {
System.out.println("Enter Row "+ (i+1) + " :");
for (int j = 0; j < 4; j++) {
b[i][j] = in.nextInt();
}
}
System.out.println("Input Matrix A:");
printMatrix(a, 4, 4);
System.out.println("Input Matrix B:");
printMatrix(b, 4, 4);
//Multiply the Matrices
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
for (int k = 0; k < 4; k++) {
c[i][j] += a[i][k] * b[k][j];
}
}
}
System.out.println("Output Matrix C:");
printMatrix(c, 4, 4);
}
public static void printMatrix(int arr[][], int m, int n) {
for (int i = 0; i < m; i++) {
for (int j = 0; j < n; j++) {
System.out.print(arr[i][j] + "\t");
}
System.out.println();
}
}
}
Output
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Sample Input
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Sample data:
Input:
n = 4Matrix A[ ][ ] 2 5 6 9 8 4 12 3 6 7 3 1 12 24 2 11 Output:
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Matrix after sorting the Principal diagonal:
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Matrix after sorting the Principal diagonal:
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Sample Input
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22 14 23 25 81 86 31 10 58 64 17 12 55 33 26 14 Write a program to input N and M number of names in two different single dimensional arrays A and B respectively, such that none of them have duplicate names. Merge the arrays A and B into a single array C, such that the resulting array is sorted alphabetically. Display all the three arrays.
Test your program for the following data and some random data:
Sample data:
Input:
Enter the names in array A, N = 2
Enter the names in array B, M = 3
First array: A
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Anil
Second array: B
Usha
Sachin
JohnOutput:
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Anil
John
Sachin
Suman
Usha
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Anil
Suman
Sorted Second array: B
John
Sachin
Usha