добавили новый параметр: bool prompt

main.cpp

@@ -11,8 +11,9 @@ struct Input {
 };
 
 Input
-input_data(istream& in) {
-    cerr << "Enter number count, numbers and bin count: ";
+input_data(istream& in, bool prompt) {
+    if (prompt) {
+    cerr << "Enter number count, numbers and bin count: ";}
 
     size_t number_count;
     in >> number_count;
@@ -31,7 +32,7 @@ input_data(istream& in) {
 
 int
 main() {
-    auto in = input_data(cin);
+    auto in = input_data(cin, true);
     auto bins = make_histogram(in.numbers, in.bin_count);
     show_histogram_svg(bins);