main: переписана input_data и добавлена ссылка на поток

main.cpp

@@ -16,24 +16,24 @@ using namespace std;
 //  Ââîä îöåíêîê ñ êëàâèàòóðû.
 
 Input
-input_data()
+input_data(istream& in)
 {
-    Input in;
+    Input local;
     size_t number_count;
 
     cerr << "Enter number count: ";
-    cin >> number_count;
+    in >> number_count;
-    in.numbers.resize(number_count);
+    local.numbers.resize(number_count);
     for (size_t i = 0; i < number_count; i++)
-        cin >> in.numbers[i];
+        in >> local.numbers[i];
     cerr << "Enter bin count: ";
-    cin >> in.bin_count;
+    in >> local.bin_count;
-    return in;
+    return local;
 }
 
 int main()
 {
-    auto in = input_data();
+    auto in = input_data(cin);
     auto bins = make_histogram(in.numbers, in.bin_count);
     show_histogram_svg(bins);
     return 0;