Question

When the following program is fead the following input (reading from cin):

1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1

The output is surprising:

1 1 1 2 2 1 1 1 1 1 1 1 1 1 1 1

#include<iostream>
using namespace std;
int main()
{
    int arey[3][3];
    int i,j;
    for(j=0;j<=3;j++)
    {
        for(i=0;i<=3;i++)
        {
            cin>>arey[j][i];
        }
    }
    arey[0][0]=1;
    arey[3][3]=1;
    i=0,j=0;
    for(j=0;j<=3;j++)
    {
        for(i=0;i<=3;i++)
        {
            cout<<arey[j][i];
        }
    }
    return 0;
}

Can someone explain what I should change to get the same output as the input?

Answer 1

Arrays use 0 based indices, so the valid range of indices for your

int arey[3][3];

are 0 <= i < 3 and 0 <= j < 3

So you need to change the condition in your for loops to be strictly < instead of <=