добавил функцию минимума и максимума

main.cpp

@@ -2,30 +2,30 @@
 #include <iostream>
 
 using namespace std;
-
-int main()
+struct Input
 {
-    const size_t SCREEN_WIDTH = 80;
-    const size_t MAX_ASTERISK = SCREEN_WIDTH - 3 - 1;
+    vector<double> numbers;
+    size_t bin_count{};
+};
+Input input_data()
+{
+    Input in;
     size_t number_count;
     cerr << "Enter number count: ";
     cin >> number_count;
-
-    vector<double> numbers(number_count);
+    in.numbers.resize(number_count);
     cerr << "Enter numbers: ";
-    for (size_t i = 0; i < number_count; i++)
-    {
-        cin >> numbers[i];
+    for (size_t i = 0; i < number_count; i++) {
+        cin >> in.numbers[i];
     }
-
     size_t bin_count;
     cerr << "Enter bin count: ";
-    cin >> bin_count;
-
-    vector<size_t> bins(bin_count, 0);
-
-    double min = numbers[0];
-    double max = numbers[0];
+    cin >> in.bin_count;
+    return in;
+}
+void find_minmax(const vector<double>& numbers, double& min, double& max) {
+     min = numbers[0];
+     max = numbers[0];
     for (double x : numbers)
     {
         if (x < min)
@@ -37,6 +37,44 @@ int main()
             max = x;
         }
     }
+}
+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;
+
+    vector<double> numbers(number_count);
+    cerr << "Enter numbers: ";
+    for (size_t i = 0; i < number_count; i++)
+    {
+        cin >> numbers[i];
+    }
+
+    size_t bin_count;
+    cerr << "Enter bin count: ";
+    cin >> bin_count;
+    //
+    vector<size_t> bins(bin_count, 0);
+double min, max;
+find_minmax(in.numbers, min, max);
+   // double min = numbers[0];
+   // double max = numbers[0];
+    //for (double x : numbers)
+   // {
+     //   if (x < min)
+      //  {
+      //      min = x;
+      //  }
+      //  else if (x > max)
+      //  {
+      //      max = x;
+      //  }
+   // }
 
     double bin_size = (max - min) / bin_count;