CODEWITHSUNDEEP
c++arrays
Shivam
Shivam

Reputation: 2248

Creating an grid based array

I am trying to create an grid based array in c++, when I create the grid via console, it comes out fine but when I try to implement it inside an array, it messes up.

int i,j;
for(i=0;i<100;i++) {
    for(j=0;j<100;j++) {
        cout << j << " ";
    };
    cout << endl;
};

When I used to create and cout array grid, it doesnt work the same way:

int i,j, img[100][100];

for(i=0;i<100;i++) {
   for(j=0;j<100;j++) {
      cout << img[i][j] << " ";
   };
   cout << endl;
};

What am I doing wrong exactly?

This should be the correct output:

//99 rows of the following code

0 1 2 3 4 5 6 7 8 9 10 11 12 ... 99
0 1 2 3 4 5 6 7 8 9 10 11 12 ... 99
0 1 2 3 4 5 6 7 8 9 10 11 12 ... 99  
...
x99

NOTE: this consoles out fine and writes fine to file, but when I try to reproduce this using an array it gets messed up. mostly shows 0's. I need to incorporate this into an array because I need to modify specific parts of the grid.

Upvotes: 1

Views: 3164

Answers (1)

aaazalea
aaazalea

Reputation: 7910

You're printing out values in an uninitialized array. The value of img[i][j] is not j by default - you shouldn't assume anything about its default state. If you do this to initialize the array then you should get your expected output:

int i,j, img[100][100];

for(i=0;i<100;i++) {
   for(j=0;j<100;j++) {
      img[i][j]=j;
   }
}

//then print it out.

Upvotes: 3

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