Refactoring the input_data() function

Histogram/main.cpp

@@ -7,28 +7,28 @@ struct Input{
     size_t bin_count{};
 };
 
-Input input_data() {
+Input input_data(istream& in) {
     size_t number_count;
     std::cerr << "Enter number count: ";
-    std::cin >> number_count;
+    in >> number_count;
 
     std::cerr << "Enter numbers: \n";
-    Input in;
+    Input local;
     in.numbers.resize(number_count);
     for (size_t i = 0; i < number_count; ++i) {
-        std::cin >> in.numbers[i];
+        in >> local.numbers[i];
     }
 
     std::cerr << "Enter bucket: ";
-    std::cin >> in.bin_count;
+    in >> local.bin_count;
 
-    return in;
+    return local;
 };
 
 using namespace std;
 
 int main() {
-    Input in = input_data();
+    Input in = input_data(cin);
     auto bins = make_histogram(in.numbers, in.bin_count);
     show_histogram_svg(bins);
     return 0;