for loop & array

[zero0000]

Write your question here.

#include <iostream>
using namespace std;

# define width 5
# define height 6



int yo [width] [height];


int x,y;


int main()
{

 for (x=0; x<width; x++)
 for (y=0;y<height; y++)
            
        {
            
          yo[x][y]= x;
            
          cout << yo[x][y]<< endl;
            
        }
    
   
  
    return 0;
}

Hi, I was taking one of the examples and altering it. After the for loop, I assign the value of x to yo[x][y]. 0 to 4 repeats itself six times because [y] (that is, height) has the value of 6. In this case the numbers should also repeat five times again because [x] (that is, width) has a value of 5. But it does not do so. Why? Please correct me if my analysis is wrong.

Thanks

[Disch]

In this case the numbers should also repeat five times again because [x] (that is, width) has a value of 5.

This is not true.

What's happening is you are filling a 5x6 array with data, and printing that data. The array conceptually looks like this:

            X
      0  1  2  3  4
     +_____________
   0 |
   1 |
Y  2 |     data
   3 |
   4 |
   5 |

You are filling each element in the array so that the element = its x position. So the filled array conceptually looks like this:

              X
        0  1  2  3  4
     +_______________
   0 |  0  1  2  3  4
   1 |  0  1  2  3  4
Y  2 |  0  1  2  3  4
   3 |  0  1  2  3  4
   4 |  0  1  2  3  4
   5 |  0  1  2  3  4

You are then printing this array in column major order... that is:
column 0, row 0
column 0, row 1
column 0, row 2
...
column 0, row 5
column 1, row 0
column 1, row 1
...
etc


The values repeat 6 times because you are printing the first column of data... all of which is the same value.

It does not repeat an additional 5 times because each column has different data.