code: добавлен параметр prompt

main.cpp

@@ -12,10 +12,12 @@ struct Input
 };
 
 Input
-input_data(istream& stream)
+input_data(istream& stream, bool prompt)
 {
     size_t number_count;
+    if (prompt) {
         cerr << "Enter number count: ";
+    }
     stream >> number_count;
     Input in;
     in.numbers.resize(number_count);
@@ -23,14 +25,16 @@ input_data(istream& stream)
     {
         stream >> in.numbers[i];
     }
+    if (prompt) {
         cerr << "Enter bin count: ";
+    }
     stream >> in.bin_count;
     return in;
 }
 
 int main()
 {
-    Input in = input_data(cin);
+    Input in = input_data(cin, true);
     vector<size_t> bins = make_histogram(in.numbers, in.bin_count);
     show_histogram_svg(bins);
 }