Myujth

I have written a big program and it has some unexpected behavior so I've made another smaller program to test the issue.

My problem is that for some reason in a 2x2 array whenever I cin element [0][2]
it also copies to the element [1][0]

For example if my array is

000
000
000

and I input the top right element to 'A' (say) then the middle left element also changes to 'A' and vice versa.
The same issue exists for the elements at [1][2] and [2][0]

Here is my code:

#include<iostream>

using namespace std ;

char array[2][2];

void display()

 cout<<endl;
 for (int i=0;i<3;i++ )
 
 for (int j=0;j<3;j++ )
 
 cout<<array[i][j];
 
 cout<<endl;
 


int main ()

 for (int i=0;i<3;i++ )
 
 for (int j=0;j<3;j++ )
 
 array[i][j]='0';
 
 
 display();
 cin>>array[0][2];
 display();

If you want to access up to array[2][2] your array has to be defined as char array[3][3];.

Valid indexes for an array T foo[SIZE] are 0 ... SIZE - 1.

Please note that array is a very bad name since there is also std::array<> and you are using using namespace std; which will spill out all symbols from the namespace std into the global namespace.

With

#include <iostream>

using namespace std;

char array[3][3];

void display()

 cout << endl;
 for (int i = 0; i < 3; i++) 
 for (int j = 0; j < 3; j++) 
 cout << array[i][j];
 
 cout << endl;
 


int main()

 for (int i = 0; i < 3; i++) 
 for (int j = 0; j < 3; j++) 
 array[i][j] = '0';
 
 

 display();
 cin >> array[0][2];
 display();

it works as expected:

Output:

000
000
000
A

00A
000
000