Question

1. Write another function called checkdiag2 (int checkdiag2 (int matrix[][100], int size)) that will return 1 if all the numbers on the antidiagonal are the same and 0 otherwise.

2. Rewrite your main program to use 2D dynamic allocation instead for your array. Your array will have rows and columns depending of the first integer read from the file.

3. Call your function from the main program. A typical report would look like The matrix is 8x8 and all the numbers on the antidiagonal are the same.

4. Check your program with the same data files as before.

Answer 1

#include <bits/stdc++.h>

#include <fstream>

using namespace std;

int checkdiag2(vector< vector<int> > &matrix, int size) {

  int count=0, repeated_number;

  for (int i = 0; i < size; i++) {

    for (int j = 0; j < size; j++) {

      // antidiagonal condition

      if ( (i + j + 1) == size ) {

        if(i==0) {

          repeated_number = matrix[i][j];

          count++;

        }

        else

          if(matrix[i][j]==repeated_number)

          count++;

        else

          break;

      }

    }

  }

  if(count==size)

    return 1;

  else

    return 0;

}

int main()

{

  int size;

  ifstream MyReadFile("filename.txt");

  while (getline (MyReadFile, myText)) {

    size = stoi(myText);

  }

  

  // Dynamic 2D array

  // I have itialized the 2D array, because there is no instruction about it

  vector< vector<int> > matrix( size , vector<int> (size, 0));

  

  // You can also input the 2D array from the user like this :

  // vector< vector<int> > matrix( size , vector<int> (size));

  // for (int i = 0; i < size; i++) {

  // for (int j = 0; j < size; j++) {

  // // antidiagonal condition

  // cin>>matrix[i][j];

  // }

  // }

  

  int value = checkdiag2(matrix,size);

  if(value)

    cout<<"The matrix is "<<size<<"x"<<size<<" and all the numbers on the antidiagonal are the same.";

  else

    cout<<"The matrix is "<<size<<"x"<<size<<" and all the numbers on the antidiagonal are not same.";

}