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Two methods of printing Yang Hui triangle with PHP

WBOY
WBOYOriginal
2016-07-25 09:13:001358browse

Example 1, print Yang Hui triangle directly in a loop.

  2. //Yang Hui Triangle
  3. for ($i=6;$i >= 0;$i--)
  4. {
  5. for ($j=$i;$j < = 6;$j++)
  6. {
  7. if ($j <= 6-1)
  8. {
  9. echo "a";
  10. }else
  11. {
  12. echo "
    ";
  13. }
  14. }
  15. }
  16. ?>
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Example 2, PHP prints Yang Hui's triangle custom function

  3. Input the order of Yang Hui's triangle:
  6. //Yang Hui Triangle Custom function
  7. function yanghui($line)
  8. {
  9. echo "";
  10. for($i=1;$i<=$line;$i++)
  11. {
  12. echo "
    13. ";
  13. for($j=1;$j<=$i;$j++)
  14. {
  15. $yh[$i][1]=1;
  16. if ($i==$j) $yh[$i][ $j]=1;
  17. else $yh[$i][$j]=$yh[$i-1][$j-1]+$yh[$i-1][$j];
  18. echo "
    19. ";
  19. }
  20. echo "
    21. ";
  21. }
  22. echo "
    23. ";
  23. echo $yh[$i][$j];
  24. echo "
    25. ";
  25. }
  26. if($_POST['submit']) yanghui($_POST['givenlines']);
  27. ?>
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