Write a program to declare a square matrix a[][] of order M × M where ‘M’ is the number of rows and the number of columns, such that M must be greater than 2 and less than 10. Accept the value of M as user input. Display an appropriate message for an invalid input. Allow the user to input integers into this matrix. Perform the following tasks:
(a) Display the original matrix.
(b) Rotate the matrix 90o clockwise as shown below:
Original matrix Rotated matrix
1 2 3 7 4 1
4 5 6 8 5 2
7 8 9 9 6 3
(c) Find the sum of the elements of the four corners of the matrix.
Test your program for the following data and some random data:
Example 1:
INPUT:
M = 3
3 4 9
2 5 8
1 6 7
OUTPUT:
ORIGINAL MATRIX
3 4 9
2 5 8
1 6 7
MATRIX AFTER ROTATION
1 2 3
6 5 4
7 8 9
Sum of the corner elements = 20
Example 2:
INPUT:
M = 4
1 2 4 9
2 5 8 3
1 6 7 4
3 7 6 5
OUTPUT:
ORIGINAL MATRIX
1 2 4 9
2 5 8 3
1 6 7 4
3 7 6 5
MATRIX AFTER ROTATION
3 1 2 1
7 6 5 2
6 7 8 4
5 4 3 9
Sum of the corner elements = 18
Example 3:
INPUT:
M = 14
OUTPUT:
SIZE OUT OF RANGE
import java.io.*;
class Rotate{
public static void main(String args[])throws IOException{
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.print("M = ");
int m = Integer.parseInt(br.readLine());
if(m < 3 || m > 9){
System.out.println("SIZE OUT OF RANGE");
return;
}
int a[][] = new int[m][m];
System.out.println("Enter matrix elements:");
for(int i = 0; i < m; i++){
for(int j = 0; j < m; j++){
a[i][j] = Integer.parseInt(br.readLine());
}
}
System.out.println("ORIGINAL MATRIX");
for(int i = 0; i < m; i++){
for(int j = 0; j < m; j++){
System.out.print(a[i][j] + "\t");
}
System.out.println();
}
int r[][] = new int[m][m];
int row = 0; int col = m - 1;
for(int i = 0; i < m; i++){
row = 0;
for(int j = 0; j < m; j++){
r[row++][col] = a[i][j];
}
col--;
}
System.out.println("MATRIX AFTER ROTATION");
for(int i = 0; i < m; i++){
for(int j = 0; j < m; j++){
System.out.print(r[i][j] + "\t");
}
System.out.println();
}
int last = m - 1;
int sum = a[0][0] + a[0][last] + a[last][0] + a[last][last];
System.out.println("Sum of the corner elements = " + sum);
}
}
