DE2 board, 7-segment display via schematic

I'm trying to create a simple circuit, using 4 switches (8-4-2-1) to drive digital logic, in order to light a single 7-segment LED.

I've created the 4 input pins, wired them to inputs A,B,C, and D of a 7447 (BCD to 7-segment decoder), and wired the 7 outputs OA through OG) to output pins. I've tied the other 3 inputs (LTN, RBIN, BIN) to ground. I've assigned switches 0 through 3 to the inputs, and HEX0[*] to the outputs. However, when I compile, I get warnings that:

Warning: Design contains 4 input pin(s) that do not drive logic

Warning (15610): No output dependent on input pin "B"

Warning (15610): No output dependent on input pin "C"

Warning (15610): No output dependent on input pin "D"

Warning (15610): No output dependent on input pin "A"

Warning: Following 7 pins have nothing, GND, or VCC driving datain port -- changes to this connectivity may change fitting results

Info: Pin OA has VCC driving its datain port

Info: Pin OB has VCC driving its datain port

Info: Pin OC has VCC driving its datain port

Info: Pin OD has VCC driving its datain port

Info: Pin OE has VCC driving its datain port

Info: Pin OF has VCC driving its datain port

Info: Pin OG has VCC driving its datain port

Downloading to the DE2 board yields no results. The HEX0 (rightmost) 7 segment display is off, and no change in the input switches produces any change. It seems that the 7447 chip is not being utilized correctly... That the input pins are not connected to inputs on the 7447, and likewise for the outputs.

I don't think I'm doing anything wrong with wiring or pin assignments; when I connect a switch directly to an LED, it works fine. If I put an inverter between them, that works fine. But the 7447 doesn't seem to work correctly. Any suggestions?