Update Machine.java

mutants/mutant-4/swen90006/machine/Machine.java

@@ -63,7 +63,7 @@ public class Machine
     
   private void do_sub(int dest, int src1, int src2)
   {
-    regs[dest] = regs[src1] - regs[src2];
+    regs[dest] = regs[src2] - regs[src1];
   }
     
   private void do_mult(int dest, int src1, int src2)