3. Записаны модульные тесты

.gitignore

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+/bin
+/obj
+/lab01.depend
+/lab01.layout
+/unittest.depend
+/unittest.layout

histogram.cpp

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+#include "histogram.h"
+
+using namespace std;
+
+void
+find_minmax(const vector<double>& numbers, double& min, double& max) {
+    min = numbers[0];
+    max = numbers[0];
+
+    for (double x : numbers) {
+        if (x < min) {
+            min = x;
+        }
+        else if (x > max) {
+            max = x;
+        }
+    }
+}
+
+vector<size_t>
+make_histogram(const vector<double>& numbers, size_t bin_count){
+    size_t number_count = numbers.size();
+    vector<size_t> bins(bin_count);
+    double min, max;
+    find_minmax(numbers, min, max);
+
+    double bin_size = (max - min) / bin_count;
+
+    for (size_t i = 0; i < number_count; i++) {
+        bool found = false;
+        for (size_t j = 0; (j < bin_count - 1) && !found; j++) {
+            auto lo = min + j * bin_size;
+            auto hi = min + (j + 1) * bin_size;
+            if ((lo <= numbers[i]) && (numbers[i] < hi)) {
+                bins[j]++;
+                found = true;
+            }
+        }
+        if (!found) {
+            bins[bin_count - 1]++;
+        }
+    }
+    return bins;
+}

histogram.h

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+#pragma once
+#include <vector>
+
+std::vector<size_t>
+make_histogram(const std::vector<double>& numbers, size_t bin_count);

histogram_internal.h

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+#pragma once
+#include <vector>
+
+void
+find_minmax(const std::vector<double>& numbers, double& min, double& max);

lab01.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="lab01" />
+		<Option pch_mode="2" />
+		<Option compiler="gcc" />
+		<Build>
+			<Target title="Debug">
+				<Option output="bin/Debug/lab01" 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/lab01" 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" />
+			<Add option="-fexceptions" />
+		</Compiler>
+		<Unit filename=".gitignore" />
+		<Unit filename="histogram.cpp" />
+		<Unit filename="histogram.h">
+			<Option target="&lt;{~None~}&gt;" />
+		</Unit>
+		<Unit filename="histogram_internal.h">
+			<Option target="&lt;{~None~}&gt;" />
+		</Unit>
+		<Unit filename="main.cpp" />
+		<Unit filename="text.cpp" />
+		<Unit filename="text.h">
+			<Option target="&lt;{~None~}&gt;" />
+		</Unit>
+		<Extensions>
+			<lib_finder disable_auto="1" />
+		</Extensions>
+	</Project>
+</CodeBlocks_project_file>

main.cpp

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

text.cpp

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+#include "text.h"
+#include <iostream>
+
+using namespace std;
+
+void
+show_histogram_text(const vector<size_t>& bins){
+    const size_t SCREEN_WIDTH = 80;
+    const size_t MAX_ASTERISK = SCREEN_WIDTH - 3 - 1;
+
+    auto bin_count = bins.size();
+
+    size_t max_count = 0;
+    for (size_t i = 0; i < bin_count; i++){
+        size_t Count = bins[i];
+        if (max_count < Count){
+            max_count = Count;
+        }
+    }
+    if (max_count <= MAX_ASTERISK){
+        for (size_t i = 0; i < bin_count; i++){
+            size_t Count = bins[i];
+            if (Count < 100){
+                cout << " ";
+            }
+            if (Count < 10){
+                cout << " ";
+            }
+            cout << Count << "|";
+            for (size_t j = 0; j < Count; j++){
+                cout << "*";
+            }
+            cout << "\n";
+        }
+    }
+    else{
+        for (size_t i = 0; i < bin_count; i++){
+            size_t Count = bins[i];
+            size_t height = 76 * (static_cast<double>(Count) / max_count);
+            if (Count < 100){
+                cout << " ";
+            }
+            if (Count < 10){
+                cout << " ";
+            }
+            cout << Count << "|";
+            for (size_t j = 0; j < height; j++){
+                cout << "*";
+            }
+            cout << "\n";
+        }
+    }
+}

text.h

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+#pragma once
+#include <vector>
+
+void
+show_histogram_text(const std::vector<size_t>& bins);

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>
+		<Unit filename="doctest.h">
+			<Option target="&lt;{~None~}&gt;" />
+		</Unit>
+		<Unit filename="histogram.cpp" />
+		<Unit filename="histogram_internal.h" />
+		<Unit filename="unittest.cpp" />
+		<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"
+
+TEST_CASE("distinct positive numbers") {
+    double min = 0;
+    double max = 0;
+    find_minmax({1, 2}, min, max);
+    CHECK(min == 1);
+    CHECK(max == 2);
+}
+
+TEST_CASE("blank vector") {
+    double min = 0;
+    double max = 0;
+    find_minmax({NULL}, min, max);
+    CHECK(min == 0);
+    CHECK(max == 0);
+}
+
+TEST_CASE("one element vector"){
+    double min = 0;
+    double max = 0;
+    find_minmax({5}, min, max);
+    CHECK(min == 5);
+    CHECK(max == 5);
+}
+
+TEST_CASE("negative elements vector"){
+    double min = 0;
+    double max = 0;
+    find_minmax({-3, -7, -24}, min, max);
+    CHECK(min == -24);
+    CHECK(max == -3);
+}
+
+TEST_CASE("same elements vector"){
+    double min = 0;
+    double max = 0;
+    find_minmax({8, 8, 8}, min, max);
+    CHECK(min == 8);
+    CHECK(max == 8);
+}