diff --git a/main.cpp b/main.cpp
index 4d8de74..686b402 100644
--- a/main.cpp
+++ b/main.cpp
@@ -12,28 +12,28 @@ struct Input
         size_t bin_count{};
     };
 
-Input input_data()
+Input input_data(istream& stream)
 {
     Input in;
     size_t number_count;
     cerr << "Enter num count >>";
-    cin >> number_count;
+    stream >> number_count;
 
     in.numbers.resize(number_count);
 
     for (size_t i = 0; i < number_count; i++)
     {
-        cin >> in.numbers[i];
+        stream >> in.numbers[i];
     }
-
     cerr << "Enter bin count >>";
-    cin >> in.bin_count;
+    stream >> in.bin_count;
     return in;
 }
 
 int main()
 {
-    auto in = input_data();
+    bool prompt = true;
+    auto in = input_data(cin);
     auto bins = make_histogram(in.numbers, in.bin_count);
     show_histogram_svg(bins);
 }