diff --git a/Project0/src/fraction_summing/fraction_toolbox.cpp b/Project0/src/fraction_summing/fraction_toolbox.cpp
index d3a29ca..b3963c7 100644
--- a/Project0/src/fraction_summing/fraction_toolbox.cpp
+++ b/Project0/src/fraction_summing/fraction_toolbox.cpp
@@ -20,7 +20,7 @@ void print_fraction_array(fraction frac_array[], int n)
 
 fraction square_fraction(fraction frac)
 {
-    struct fraction square = { frac.num * frac.num, frac.denom * frac.denom };
+    fraction square = { frac.num * frac.num, frac.denom * frac.denom };
     return square;
 }
 
@@ -64,33 +64,33 @@ void reduce_fraction_inplace(fraction & frac)
 
 fraction add_fractions(fraction frac1, fraction frac2)
 {
-    int g = gcd(frac1.denom, frac2.denom);
+    int d = frac1.denom;
 
-    {
-        int fac1 = frac1.denom / g;
-        frac1.num *= fac1;
-        frac1.denom *= fac1;
-    }
+    frac1.num *= frac2.denom;
+    frac1.denom *= frac2.denom;
 
-    {
-        int fac2 = frac2.denom / g;
-        frac2.num *= fac2;
-        frac2.denom *= fac2;
-    }
+    frac2.num *= d;
+    frac2.denom *= d;
 
-    struct fraction result = { frac1.num + frac2.num, g };
+    fraction result = { frac1.num + frac2.num, frac1.denom };
+    reduce_fraction_inplace(result);
     return result;
 }
 
+fraction sum_fraction_array(fraction frac_array[], int n) {
+    fraction sum = { 0, 1 };
+    print_fraction_array(frac_array, n);
+    for (int i = 0; i < n; i++) {
+        fraction frac = frac_array[i];
+        sum = add_fractions(sum, frac);
+        print_fraction(sum);
+    }
+    return sum;
+}
+
 double sum_fraction_array_approx(fraction frac_array[], int n)
 {
-    struct fraction sum = { 0, 0 };
-    for (int i = 0; i < n; i++) {
-        struct fraction frac = frac_array[i];
-        sum = add_fractions(sum, frac);
-    }
-
-    return fraction2double(sum);
+    return fraction2double(sum_fraction_array(frac_array, n));
 
     // the approximation in this function is given by the fact that floating
     // point numbers cannot represent precisely rational numbers due to the
@@ -102,7 +102,7 @@ double sum_fraction_array_approx(fraction frac_array[], int n)
 void fill_fraction_array(fraction frac_array[], int n)
 {
     fraction temp_frac;
-    temp_frac.num = 0;
+    temp_frac.num = 1;
     temp_frac.denom = 1;
     for (int i = 0; i <= n; i++)
     {
diff --git a/Project0/src/fraction_summing/main.cpp b/Project0/src/fraction_summing/main.cpp
index e65eaed..d263207 100644
--- a/Project0/src/fraction_summing/main.cpp
+++ b/Project0/src/fraction_summing/main.cpp
@@ -26,17 +26,50 @@ static void readcmdline(fraction & frac, int argc, char* argv[])
 
 static void test23467(int argc, char* argv[])
 {
-    //TODO: implement function
+    fraction frac;
+    readcmdline(frac, argc, argv);
+
+    cout << "#2: squared fraction" << endl;
+    print_fraction(square_fraction(frac));
+    
+    cout << "#3: squared fraction in-place" << endl;
+    fraction frac2 = frac;
+    square_fraction_inplace(frac2);
+    print_fraction(frac2);
+
+    cout << "#4: fraction to double" << endl;
+    cout << fraction2double(frac) << endl;
+
+    cout << "#6: gcd of fraction" << endl;
+    cout << gcd(frac) << endl;
+
+    cout << "#7: fraction reduction in-place" << endl;
+    fraction frac3 = frac;
+    reduce_fraction_inplace(frac3);
+    print_fraction(frac3);
 }
 
 static void test5()
 {
-    //TODO: implement function
+    int a, b;
+    cout << "#5: recursive gcd of two integers" << endl;
+    cout << "Input first number: ";
+    cin >> a;
+    cout << "Input second number: ";
+    cin >> b;
+    cout << "GCD is: " << gcd(a, b) << endl;
 }
 
 static void test_array_functions(int n)
 {
-    //TODO: implement function
+    fraction* a = (fraction*) malloc(sizeof(fraction) * n);
+    fill_fraction_array(a, n);
+    
+    cout << "Sum of array as fraction: " << endl;
+    print_fraction(sum_fraction_array(a, n)); 
+
+    cout << "Sum of array as double (approx.): " << endl;
+    cout << sum_fraction_array_approx(a, n) << endl; 
 
     //TODO: find n for which sum function breaks. Explain what is happening.
 }
@@ -56,5 +89,5 @@ static void test_toolbox(int argc, char* argv[])
 
 int main(int argc, char* argv[])
 {
-    
-}
\ No newline at end of file
+    test_toolbox(argc, argv);    
+}