Program in Java: Octal Matrix ISC Class 12 Program

import java.util.Scanner;
class OctalMatrix
{
 int A[][],m,n; //m and n are rows and columns
 OctalMatrix(int m,int n)
 {
  this.m=m;
  this.n=n;
  A = new int[m][n];
 }
 void octaltoDec()
 {
  Scanner sc=new Scanner(System.in);
  if((m<0 || m>10) && (n<2 || n>6))
  {
   System.out.println("Invalid Row or Column");
   return;
  }
  else
  {
   //Enter the values into the matrix
   System.out.println("Enter the octal numbers into the matrix:");
   for(int i=0;i<m;i++)
   {
    for(int j=0;j<n;j++)
    {
     int m = sc.nextInt();
     if(m>=0 && m<=7)
     {
      A[i][j]=m;
     }
     else{
      System.out.println("Invalid Input");
      return;
     }
    }
   }
   //Converting each row to octal number
   System.out.println("Converting each row to octal:");
   for(int i=0;i<m;i++)
   {
    int s=0;
    int p=n;
    for(int j=0;j<n;j++)
    { 
     s=s+A[i][j]*(int)Math.pow(8,p-1);
     p=p-1;
     System.out.print(A[i][j]+" ");
    }
    System.out.print(" Decimal:"+s);
    System.out.println();
   }
  }
 }
  public static void main(String args[])
  {
   Scanner sc = new Scanner(System.in);
   System.out.println("Enter the rows and columns:");
   int m=sc.nextInt();
   int n=sc.nextInt();
   OctalMatrix ob = new OctalMatrix(m,n);
   ob.octaltoDec();
  }
 }