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Nested Loops

• Sometimes the iteration count of the inner loop depends on the outer loop.
• Example: printing a triangle shape.

  []
  [][]
  [][][]
  [][][][]
  

• To print n rows, use the loop.

  for (int i = 1; i <= n; i++)
  {
     print triangle row
  }
  

• Each row contains i boxes.

  for (int j = 1; j <= i; j++)
     cout << "[]";
  cout << "\n";
  

• Putting the two loops together yields

  for (int i = 1; i <= n; i++)
  {
     for (int j = 1; j <= i; j++)
        cout << "[]";
     cout << "\n";
  }
  

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