implemented new criteria for stopping simulation as well as a failure/success message

src/main.cpp

@@ -8,7 +8,7 @@
 #include "Vehicle.h"
 #include "sim.h"
 
-void sim(struct Vehicle &);
+bool sim(struct Vehicle &);
 
 int main() {
   Vehicle State;
@@ -47,10 +47,15 @@ int main() {
   State.burntime = 3.45 - 0.148;                                // [s]
   State.mdot = State.massPropellant / State.burntime;           // [kg/s]
 
-  sim(State, PrevState);
+  bool outcome = sim(State, PrevState);
 
-  std::cout << "Finished";
-  std::cin.get();
+  std::cout << "Finished"
+            << "\n";
+
+  if (outcome == 1)
+    std::cout << "Success!";
+  else if (outcome == 0)
+    std::cout << "Failed!";
 
   return 0;
 }