first commit

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& minN, double& maxN);
+
+#endif // HISTOGRAM_INTERNAL_H_INCLUDED

text.cpp

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+#include "text.h"
+#include <iostream>
+#include <vector>
+using namespace std;
+void show_histogram_text(const vector <size_t>& bins,size_t bin_count, size_t max_count){
+    const size_t SCREEN_WIDTH = 80;
+    const size_t MAX_ASTERISK = SCREEN_WIDTH - 6 - 1;
+
+    bool scaling = false;
+
+    if (max_count > MAX_ASTERISK){
+        scaling = true;
+    }
+
+    for (size_t i = 0; i < bin_count; i++){
+        cout << "   ";
+        if (bins[i] < 100){
+            cout << ' ';
+        }
+        if (bins[i] < 10){
+            cout << ' ';
+        }
+        cout << bins[i] << '|';
+
+        size_t number_of_stars = bins[i];
+
+        if (scaling){
+            if (bins[i] == max_count){
+                number_of_stars = MAX_ASTERISK * 1.0;
+            }
+            else {
+                number_of_stars = MAX_ASTERISK * (static_cast<double>(bins[i]) / max_count);
+            }
+        }
+
+        for (size_t j = 0; j < number_of_stars; j++){
+            cout << '*';
+        }
+        cout << endl;
+    }
+}

text.h

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

unittest.cbp

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+<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
+<CodeBlocks_project_file>
+	<FileVersion major="1" minor="6" />
+	<Project>
+		<Option title="unittest" />
+		<Option pch_mode="2" />
+		<Option compiler="gcc" />
+		<Build>
+			<Target title="Debug">
+				<Option output="bin/Debug/unittest" prefix_auto="1" extension_auto="1" />
+				<Option object_output="obj/Debug/" />
+				<Option type="1" />
+				<Option compiler="gcc" />
+				<Compiler>
+					<Add option="-g" />
+				</Compiler>
+			</Target>
+			<Target title="Release">
+				<Option output="bin/Release/unittest" prefix_auto="1" extension_auto="1" />
+				<Option object_output="obj/Release/" />
+				<Option type="1" />
+				<Option compiler="gcc" />
+				<Compiler>
+					<Add option="-O2" />
+				</Compiler>
+				<Linker>
+					<Add option="-s" />
+				</Linker>
+			</Target>
+		</Build>
+		<Compiler>
+			<Add option="-Wall" />
+		</Compiler>
+		<Extensions>
+			<lib_finder disable_auto="1" />
+		</Extensions>
+	</Project>
+</CodeBlocks_project_file>

unittest.cpp

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+#define DOCTEST_CONFIG_NO_MULTITHREADING
+#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
+#include "doctest.h"
+#include "histogram_internal.h"
+#include "histogram.h"
+
+TEST_CASE("distinct positive numbers") {
+    double minN = 0;
+    double maxN = 0;
+    find_minmax({1, 2}, minN, maxN);
+    CHECK(minN == 1);
+    CHECK(maxN == 2);
+}