Fixing while

src/main/java/chocopy/pa3/CodeGenImpl.java

@@ -718,13 +718,13 @@ public class CodeGenImpl extends CodeGenBase
         {
             Label startLoop = generateLocalLabel(); 
             backend.emitLocalLabel(startLoop, "Beginning of while loop");
-            node.condition.dispatch(this);
+            Register result = node.condition.dispatch(this);
             Label endLoop = elseBlock;
+            backend.emitBEQZ(result, endLoop,"Jump to beginning of loop");
             for(Stmt stmt:node.body)
                 stmt.dispatch(this);
             backend.emitJ(startLoop, "Jump to beginning of loop");
             backend.emitLocalLabel(endLoop, "End of while loop");
-
             return null;
         }