is there anything wrong with the following code? how come the %s display a square insstead of the word i want??

Qt Code: 
  1. if (nodeData.addr==1)
  2. 	 {
  3. 		nodeName = "room";
  4. 	 }
  5. 	 else if (nodeData.addr==2)
  6. 	 {
  7. 		nodeName = "bed";
  8. 	 }
  9. 	 else if (nodeData.addr==3)
  10. 	 {
  11. 		nodeName = "kitchen";
  12. 	 }
  13. 	 else
  14. 	 {
  15. 	 nodeName = "End Device";
  16. 	 }
  17.  
  18. 	if (nodeData.addr==0)					//node 0 
  19. 	{
  20. 		// Write node number
  21. 		//qsTemp.sprintf("Node: %d", nodeData.addr);
  22. 		qsTemp.sprintf("Access Point");
  23. 		//xpainter->setFont(addrFont);
  24. 		painter->setFont(timeFont);
  25. 		painter->drawText(-50,-15,100,20,Qt::AlignCenter , qsTemp,0);
  26. 	}
  27.     else
  28. 	{
  29. 		// Write node number
  30. 		 qsTemp.sprintf("%s %d" ,nodeName, nodeData.addr );
  31. 		//xpainter->setFont(addrFont);
  32. 		painter->setFont(timeFont);
  33. 		painter->drawText(-50,-22,100,20,Qt::AlignCenter , qsTemp,0);
  34. 	}
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