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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		generateMatrixFile(4, 3);
  13. 	}
  14.  
  15.     public static void generateMatrixFile(int n , int m) {
  16.         int A[][] = new int[m][n]; // Switched m and n
  17.         int k=1, c1=0, c2=n-1, r1=0, r2=m-1; // Switched m and n
  18.         while (k<=n*m) {
  19.             for (int i=c1;i<=c2 && k<=n*m;i++) {
  20.                 A[r1][i]=k++;
  21.             }
  22.             for(int j=r1+1;j<=r2 && k<=n*m;j++) {
  23.                 A[j][c2]=k++;
  24.             }
  25.             for(int i=c2-1;i>=c1 && k<=n*m;i--) {
  26.                 A[r2][i]=k++;
  27.             }
  28.             for(int j=r2-1;j>=r1+1 && k<=n*m;j--) {
  29.                 A[j][c1]=k++;
  30.             }
  31.             c1++;
  32.             c2--;
  33.             r1++;
  34.             r2--;
  35.         }
  36.         System.out.println("The Matrix is:");
  37.         for (int i=n-1;i>=0;i--) {
  38.             for(int j=0 ; j < m ; j++) {
  39.                 System.out.print(A[j][i]+ "\t");
  40.             }
  41.             System.out.println();
  42.         }
  43.     }
  44. }
Success #stdin #stdout 0.09s 320576KB
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Standard input is empty
stdout
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The Matrix is:
4	5	6	
3	12	7	
2	11	8	
1	10	9
https://ideone.com/EX4jt9
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
public

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