сделал функцию ввода данных

main.cpp

@@ -2,11 +2,32 @@
 #include <iostream>
 
 using namespace std;
-
+struct Input
+{
+    vector<double> numbers;
+    size_t bin_count{};
+};
+Input input_data()
+{
+    Input in;
+    size_t number_count;
+    cerr << "Enter number count: ";
+    cin >> number_count;
+    in.numbers.resize(number_count);
+    cerr << "Enter numbers: ";
+    for (size_t i = 0; i < number_count; i++) {
+        cin >> in.numbers[i];
+    }
+    size_t bin_count;
+    cerr << "Enter bin count: ";
+    cin >> in.bin_count;
+    return in;
+}
 int main()
 {
     const size_t SCREEN_WIDTH = 80;
     const size_t MAX_ASTERISK = SCREEN_WIDTH - 3 - 1;
+    Input in = input_data();
     size_t number_count;
     cerr << "Enter number count: ";
     cin >> number_count;
@@ -21,7 +42,6 @@ int main()
     size_t bin_count;
     cerr << "Enter bin count: ";
     cin >> bin_count;
-
     vector<size_t> bins(bin_count, 0);
 
     double min = numbers[0];