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Nesting Loops Explaination?

Adalaide (9)
I finally understand the basics of the for loop but I am really having a hard time grasping the concept of how and when to use a nested loop. Is there anyway someone can explain it? I've spent over an hour trying to grasp it but I have nothing. Specifically there is a question I am trying to figure out. I really want to figure it out on my own but I am having a REALLY hard time getting it.

The question is: Given numRows and numColumns, print a list of all seats in a theater. Rows are numbered, columns lettered, as in 1A or 3E. Print a space after each seat, including after the last. Ex: numRows = 2 and numColumns = 3 prints:
1A 1B 1C 2A 2B 2C

AbstractionAnon (6954)
Nested loops are often used with 2 dimension arrays such as your theatre example.
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    char seats[MAX_ROWS][MAX_COLS] = {0};
    for (int i=0; i<MAX_ROWS; i++)
   {  // process a row
        for (int j=0; j<MAX_COLS; j ++)
        {  // Process a column (seat) in current row      
             if (seat[i][j])
             //  Is the seat sold (non-zero)
             {}
        }
    }
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