diff --git a/problems/LabFour_ChapterTen.h b/problems/LabFour_ChapterTen.h
index a76811e0c7b3d85d4135793c9b7f1af6c3d38fa0..08c44f50c3fb84030c764d39bcdfd61e4d9996a4 100644
--- a/problems/LabFour_ChapterTen.h
+++ b/problems/LabFour_ChapterTen.h
@@ -81,13 +81,13 @@ public:
     * @param things A vector of geometric things whose areas are to be summed.
     * @return The sum of the areas of all geometric things in the vector [things].
     */
-    static float sumAreas(vector<labFour_pOne_GeometricThing> things);
+    static float sumAreas(vector<labFour_pOne_GeometricThing *> things);
 
     /**
     * @param things A vector of geometric things whose areas are to be summed.
     * @return The sum of the areas of all geometric things in the vector [things].
     */
-    static float sumPerimeters(vector<labFour_pOne_GeometricThing> things);
+    static float sumPerimeters(vector<labFour_pOne_GeometricThing *> things);
 };
 
 class labFour_pOne_Quadrilateral : public labFour_pOne_GeometricThing {
diff --git a/tests/LabFour.cpp b/tests/LabFour.cpp
index 3ef222263bac43992ab4c2cb7d3ce20209443a5f..66bc043838d4fd5bfc322cca957371bb5ed8e3cd 100644
--- a/tests/LabFour.cpp
+++ b/tests/LabFour.cpp
@@ -37,15 +37,15 @@ bool test_labFour_pZero(){
     input1 >> person5;
     input2 >> person6;
 
-    Common::redirIO();
+    Common::redirIO("");
     cout << person4;
     string output0 = Common::restoreIO();
 
-    Common::redirIO();
+    Common::redirIO("");
     cout << person5;
     string output1 = Common::restoreIO();
 
-    Common::redirIO();
+    Common::redirIO("");
     cout << person6;
     string output2 = Common::restoreIO();
 
@@ -155,7 +155,8 @@ bool test_labFour_pOne(){
         return false;
     }
 
-    if(rh1.getArea() != sqrt(2) / 2){
+    float area0 = sqrt(2) / 2.0;
+    if(rh1.getArea() != area0){
         cout << "Test 1g failed" << endl;
         return false;
     }
@@ -165,23 +166,26 @@ bool test_labFour_pOne(){
         return false;
     }
 
-    if(c1.getArea() != M_PI){
+    float area1 = M_PI;
+    if(c1.getArea() != area1){
         cout << "Test 1i failed" << endl;
         return false;
     }
 
-    if(c1.getPerimeter() != 2 * M_PI){
+    float perimeter0 = 2 * M_PI;
+    if(c1.getPerimeter() != perimeter0){
         cout << "Test 1j failed" << endl;
         return false;
     }
 
-    if(labFour_pOne_GeometricThing::sumAreas(things) != 1 + 2 + 9 + sqrt(2) / 2 + M_PI){
+    float sumAreas0 = 1 + 2 + 9 + sqrt(2) / 2.0 + M_PI;
+    if(labFour_pOne_GeometricThing::sumAreas(things) != sumAreas0){
         cout << "Test 1k failed" << endl;
         return false;
     }
 
-
-    if(labFour_pOne_GeometricThing::sumPerimeters(things) != 4 + 6 + 12 + 4 + 2 * M_PI){
+    float sumAreas1 = 4 + 6 + 12 + 4 + 2 * M_PI;
+    if(labFour_pOne_GeometricThing::sumPerimeters(things) != sumAreas1){
         cout << "Test 1l failed" << endl;
         return false;
     }
@@ -204,17 +208,22 @@ bool test_labFour_pTwo(){
 
 bool test_labFour_pThree(){
 
-    if(labFour_pThree_genFib({1,1}, 3) != 8){
+    float fib0 = labFour_pThree_genFib({1,1}, 3);
+    float fib1 = labFour_pThree_genFib({1,0,1}, 4);
+    float fib2 = labFour_pThree_genFib({0.25 ,0.25 ,0.5, 0.5}, 3);
+
+    if((fib0 >= 7.99) && (fib0 <= 8.01)){
         cout << "Test 3a failed" << endl;
         return false;
     }
 
-    if(labFour_pThree_genFib({1,0,1}, 4) != 9){
+    if((fib1 >= 8.99) && (fib1 <= 9.01)){
         cout << "Test 3b failed" << endl;
         return false;
     }
 
-    if(labFour_pThree_genFib({0.25 ,0.25 ,0.5, 0.5}, 3) != 2.5625){
+
+    if( (fib2 >= 2.562) && (fib2 <= 2.563)){
         cout << "Test 3c failed" << endl;
         return false;
     }