Unable to create Nested while-loop - while-loop

Question

I am supposed to "Write a program that uses two nested while loops to print off the rows and columns of a 3x3 grid (numbered 1 to 3), excluding the cells along the diagonal (i.e., where the row and column have the same value)."
I tried printing row, col = 1, 1 by adding one to each iteration.
row, col = 1, 1
while row != 3 and col != 3:
row += 1
col += 1
print (row, col)
Result should look like this:
1 2
1 3
2 1
vertically 12 on top, 13 in middle and 21 in the bottom.

Answer 1

A nested while loop generally means a second inside the first. I don't know what language you're using, but you should consider something more like:
while row <= 3:
while col <= 3:
print (row, col)
col++
col = 1
row++
This doesn't do the diagonal checks, but it demonstrates the nested loop idea:
The outer loop begins with row = 1 and col = 1.
The inner loop begins.
The inner loop counts columns 1-3, then exits;
The outer loop resets col to 1 and increments row
The next iteration of the outer loop begins with the new row.
Steps 2-5 repeat until until row = 4, at which point the outer loop exits and you're done.
Here's an example of this sort of thing in javascript, including the diagonal check:
let row = 1;
let col = 1;
// do this block until row > 3
while (row <= 3) {
// declare a new array to collect this row's output
let output = [];
// do this block until col > 3
while (col <= 3) {
// add the column or '-' to the end of the array
output.push( row === col ? '-' : col );
// increment the column
col++;
}
// row finished. emit the collected
// row with a space between the numbers
console.log(output.join(' '));
// reset column to 1
col = 1;
// do the next row
row++;
}