добавлен параметр promt

main.cpp

@@ -9,8 +9,9 @@ struct Input {
     size_t bin_count{};
 };
 Input
-input_data(istream& in) {
+input_data(istream& in,bool promt = false) {
     size_t number_count;
+    if (promt)
         cerr << "Number_count: ";
     in >> number_count;
     Input im;
@@ -18,13 +19,14 @@ input_data(istream& in) {
     for (size_t i = 0; i < number_count; i++) {
         in >> im.numbers[i];
     }
+    if (promt)
         cerr << "Enter bin_count: ";
     in >> im.bin_count;
     return im;
 }
 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);
     return 0;