hw1: fixed submission

Project0/src/fraction_summing/fraction_toolbox.cpp

@@ -90,6 +90,7 @@ double sum_fraction_array_approx(fraction frac_array[], int n)
 {
     double sum = 0;
     for (int i = 0; i < n; i++) {
+        fraction& frac = frac_array[i];
         sum += fraction2double(frac);
     }
     return sum;

Project0/src/fraction_summing/main.cpp

@@ -64,15 +64,15 @@ static void test_array_functions(int n)
 {
     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; 
     
-    // find n for which sum function breaks. Explain what is happening. n=4448,
-    // this is the first number where the numerator overflows and thus
+    // find n for which sum function breaks. Explain what is happening. n=1290
+    // this is the first number where the denominator overflows and thus
     // erroneoulsly becomes a negative number. The overflow is caused by the
     // sum_fractions function, specifically in the multiplication between
     // denominators. The approximation function doesn't overflow since fractions
@@ -94,13 +94,7 @@ static void test_toolbox(int argc, char* argv[])
     test5();
 
     cout << "\n==========  test_array_functions  ========= " << endl;
-#if 1
-    cout << "Input n: " << endl;    
-    int n;
-    cin >> n;
-#else
-    int n = 5;
-#endif
+    int n = 1290;
     test_array_functions(n);
 }