code: разделил программу на файлы

.gitignore

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+/bin
+/obj

head.h

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+#ifndef HEAD_H_INCLUDED
+#define HEAD_H_INCLUDED
+
+#include <vector>
+
+std::vector<size_t> make_histogram(const std::vector<double>& numbers, size_t bin_count);
+
+#endif // HEAD_H_INCLUDED
+

histogram_internal.h

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+#ifndef HISTOGRAM_INTERNAL_H_INCLUDED
+#define HISTOGRAM_INTERNAL_H_INCLUDED
+
+#include <vector>
+
+void find_minmax(const std:: vector<double>& numbers, double& min, double& max)
+
+#endif // HISTOGRAM_INTERNAL_H_INCLUDED

main.cpp

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+#include <iostream>
+#include <vector>
+#include <cmath>
+#include "head.h"
+#include "text.h"
+
+using namespace std;
+
+
+
+struct Input {
+    vector<double> numbers;
+    size_t bin_count{};
+};
+
+Input
+input_data() {
+    size_t number_count;
+    cin >> number_count;
+    Input in;
+    in.numbers.resize(number_count);
+
+    for (size_t i = 0; i < number_count; i++) {
+        cin >> in.numbers[i];
+    }
+
+    cout << "Enter number of bins";
+    cin >> in.bin_count;
+    return in;
+}
+
+
+
+
+int main()
+{
+    Input in = input_data();
+    auto bins = make_histogram(in.numbers, in.bin_count);
+    show_histogram_text(bins, in.bin_count);
+    return 0;
+}
+

text.cpp

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+#include <iostream>
+#include <vector>
+#include <cmath>
+#include "text.h"
+
+using namespace std;
+
+void show_histogram_text(vector <size_t> bins, size_t bin_count ) {
+
+    for (size_t i = 0; i < bin_count; i++) {
+        if (bins[i] < 100) {
+            cout << " ";
+        }
+        if (bins[i] < 10) {
+            cout << " ";
+        }
+        cout << bins[i] << "|";
+        for (size_t j = 0; j < bins[i]; j++) {
+            cout << "*";
+        }
+        cout << "\n";
+    }
+}

text.h

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+#ifndef TEXT_H_INCLUDED
+#define TEXT_H_INCLUDED
+
+#include <vector>
+
+void show_histogram_text(std::vector <size_t> bins, size_t bin_count);
+
+#endif // TEXT_H_INCLUDED