diff --git a/tests/extraTestsProb0.cpp b/tests/extraTestsProb0.cpp
index 587167ea8114fb6aa7bfff1ef30d265743cb540b..377c0f56575028c57754af4215930ff09b5665d6 100644
--- a/tests/extraTestsProb0.cpp
+++ b/tests/extraTestsProb0.cpp
@@ -10,7 +10,7 @@ int Hamming(unsigned long aa, unsigned long bb);
 long tau(long nn);
 int primorial(int nn);
 
-int test_0a(){
+float test_0a(){
 
     float total = PROB_0A;
 
@@ -37,12 +37,12 @@ int test_0a(){
     }
 
     if (case3 != 32){
-        cout << "-1: Hamming(4294967295,0) = 32, but your function returned Hamming(4294967295,0) = " << case3 << endl;
+        cout << "-2.5: Hamming(4294967295,0) = 32, but your function returned Hamming(4294967295,0) = " << case3 << endl;
         total -= 2.5;
     }
 
-    if (case4 != 9){
-        cout << "-1: Hamming(3725,845) = 59, but your function returned Hamming(3725,845) = " << case4 << endl;
+    if (case4 != 59){
+        cout << "-2.5: Hamming(3725,845) = 59, but your function returned Hamming(3725,845) = " << case4 << endl;
         total -= 2.5;
     }
 
@@ -62,27 +62,27 @@ float test_0b() {
     int case4 = tau(69300); // = 38
 
     if (case0 != 7){
-        cout << "-1: tau(7) = 7, but your function returned tau(7) = " << case0 << endl;
+        cout << "-2: tau(7) = 7, but your function returned tau(7) = " << case0 << endl;
         total -= 2;
     }
 
     if (case1 != 113){
-        cout << "-1: tau(113) = 113, but your function returned tau(113) = " << case1 << endl;
+        cout << "-3: tau(113) = 113, but your function returned tau(113) = " << case1 << endl;
         total -= 2;
     }
 
     if (case2 != 8){
-        cout << "-1: tau(15) = 8, but your function returned tau(15) = " << case2 << endl;
+        cout << "-2: tau(15) = 8, but your function returned tau(15) = " << case2 << endl;
         total -= 2;
     }
 
     if (case3 != 42){
-        cout << "-1: tau(117649) = 42, but your function returned tau(117649) = " << case3 << endl;
+        cout << "-3: tau(117649) = 42, but your function returned tau(117649) = " << case3 << endl;
         total -= 3;
     }
 
     if (case4 != 38){
-        cout << "-1: tau(69300) = 38, but your function returned tau(69300) = " << case4 << endl;
+        cout << "-3: tau(69300) = 38, but your function returned tau(69300) = " << case4 << endl;
         total -= 3;
     }
 
@@ -100,27 +100,27 @@ float test_0c() {
     int case4 = primorial(100); // = 56070
 
     if (case0 != 2){
-        cout << "-1: primorial(2) = 2, but your function returned primorial(2) = " << case0 << endl;
+        cout << "-3: primorial(2) = 2, but your function returned primorial(2) = " << case0 << endl;
         total -= 3;
     }
 
     if (case1 != 30){
-        cout << "-1: primorial(5) = 30, but your function returned primorial(5) = " << case1 << endl;
+        cout << "-3: primorial(5) = 30, but your function returned primorial(5) = " << case1 << endl;
         total -= 3;
     }
 
     if (case2 != 2310){
-        cout << "-1: primorial(12) = 2310, but your function returned primorial(12) = " << case2 << endl;
+        cout << "-3: primorial(12) = 2310, but your function returned primorial(12) = " << case2 << endl;
         total -= 3;
     }
 
     if (case3 != 92870){
-        cout << "-1: primorial(25) = 92870, but your function returned primorial(25) = " << case3 << endl;
+        cout << "-3: primorial(25) = 92870, but your function returned primorial(25) = " << case3 << endl;
         total -= 3;
     }
 
     if (case4 != 56070){
-        cout << "-1: primorial(100) = 56070, but your function returned primorial(100) = " << case4 << endl;
+        cout << "-3: primorial(100) = 56070, but your function returned primorial(100) = " << case4 << endl;
         total -= 3;
     }
 
@@ -133,14 +133,13 @@ int main() {
   float t0c = test_0c();
 
   cout << "Score problem 0a: " << t0a << "/8.0" << endl;
-  cout << "Score problem 0b: " << t0c << "/12.0" << endl;
-  cout << "Score problem 0c: " << t0a << "/12.0" << endl;
+  cout << "Score problem 0b: " << t0b << "/12.0" << endl;
+  cout << "Score problem 0c: " << t0c << "/12.0" << endl;
 
-  if (t0a && t0b && t0c) {
+  if ((t0a != PROB_0A) && (t0b != PROB_0B) && (t0c != PROB_0C)){
     // all tests passed
     exit(0);
-  }
-  else {
+  } else {
     // at least one test was failed
     exit (-1);
   }