code: add unittest, doctest, svg

histogram.cpp

@@ -0,0 +1,44 @@
+#include "histogram.h"
+#include <vector>
+using std::vector;
+// Ïîèñê ìèíèìóìà è ìàêñèìóìà
+void find_minmax(const std::vector<double>& numbers, double& min, double& max) {
+    min = numbers[0];
+    max = numbers[0];
+
+    for (double number : numbers) {
+        if (number < min) {
+            min = number;
+        }
+        if (number > max) {
+            max = number;
+        }
+    }
+}
+
+// Ðàñ÷¸ò ãèñòîãðàììû
+std::vector<size_t> make_histogram(const std::vector<double>& numbers, size_t bin_count) {
+    std::vector<size_t> bins(bin_count, 0);
+
+    double min, max;
+    find_minmax(numbers, min, max);
+
+    double bin_size = (max - min) / bin_count;
+
+    for (double number : numbers) {
+        bool found = false;
+        for (size_t j = 0; (j < bin_count - 1) && !found; j++) {
+            double lo = min + j * bin_size;
+            double hi = min + (j + 1) * bin_size;
+            if ((lo <= number) && (number < hi)) {
+                bins[j]++;
+                found = true;
+            }
+        }
+        if (!found) {
+            bins[bin_count - 1]++;
+        }
+    }
+
+    return bins;
+}

histogram.h

@@ -0,0 +1,9 @@
+#ifndef HISTOGRAM_H_INCLUDED
+#define HISTOGRAM_H_INCLUDED
+#include <vector>
+using std::vector;
+std::vector<size_t>
+make_histogram(const std::vector<double>& numbers, size_t bin_count);
+
+
+#endif // HISTOGRAM_H_INCLUDED

histogram_internal.h

@@ -0,0 +1,7 @@
+#ifndef HISTOGRAM_INTERNAL_H_INCLUDED
+#define HISTOGRAM_INTERNAL_H_INCLUDED
+#include <vector>
+using std::vector;
+void find_minmax(const std::vector<double>& numbers, double& min, double& max)
+
+#endif // HISTOGRAM_INTERNAL_H_INCLUDED

main.cpp

@@ -4,9 +4,6 @@
 #include "text.h"
 using namespace std;
 
-const size_t SCREEN_WIDTH = 80;
-const size_t MAX_ASTERISK = SCREEN_WIDTH - 3 - 1;
-
 struct Input {
     vector<double> numbers;
     size_t bin_count{};

svg.cpp

@@ -0,0 +1,62 @@
+#include <iostream>
+#include <vector>
+#include <string>
+#include "svg.h"
+
+using namespace std;
+
+void svg_begin(double width, double height) {
+    cout << "<?xml version='1.0' encoding='UTF-8'?>\n";
+    cout << "<svg "
+         << "width='" << width << "' "
+         << "height='" << height << "' "
+         << "viewBox='0 0 " << width << " " << height << "' "
+         << "xmlns='http://www.w3.org/2000/svg'>\n";
+}
+
+void svg_end() {
+    cout << "</svg>\n";
+}
+
+void svg_text(double left, double baseline, string text) {
+    cout << "<text x='" << left << "' y='" << baseline << "'>" << text << "</text>\n";
+}
+
+void svg_rect(double x, double y, double width, double height, string stroke = "black", string fill = "black") {
+    cout << "<rect x='" << x << "' y='" << y << "' width='" << width << "' height='" << height
+         << "' stroke='" << stroke << "' fill='" << fill << "' />\n";
+}
+
+void show_histogram_svg(const vector<size_t>& bins) {
+    if (bins.empty()) {
+        cerr << "Error: Empty bins vector\n";
+        return;
+    }
+
+    const auto IMAGE_WIDTH = 400;
+    const auto IMAGE_HEIGHT = 300;
+    const auto TEXT_LEFT = 20;
+    const auto TEXT_BASELINE = 20;
+    const auto TEXT_WIDTH = 50;
+    const auto BIN_HEIGHT = 30;
+    const auto MAX_WIDTH = IMAGE_WIDTH - TEXT_WIDTH;
+
+    svg_begin(IMAGE_WIDTH, IMAGE_HEIGHT);
+
+    double top = 0;
+    size_t max_count = bins[0];
+    for (size_t bin : bins) {
+        if (max_count < bin) {
+            max_count = bin;
+        }
+    }
+
+    for (size_t bin : bins) {
+        const double bin_width = MAX_WIDTH * (static_cast<double>(bin) / max_count);
+        svg_text(TEXT_LEFT, top + TEXT_BASELINE, to_string(bin));
+        svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT, "black", "red");
+        top += BIN_HEIGHT;
+    }
+
+    svg_end();
+}

svg.h

@@ -0,0 +1,9 @@
+#ifndef SVG_H_INCLUDED
+#define SVG_H_INCLUDED
+
+#include <vector>
+#include <cstddef>
+
+void show_histogram_svg(const std::vector<size_t>& bins);
+
+#endif // SVG_H_INCLUDED

text.cpp

@@ -0,0 +1,37 @@
+#include "text.h"
+#include <iostream>
+#include <vector>
+using std::vector;
+const size_t SCREEN_WIDTH = 80;
+const size_t MAX_ASTERISK = SCREEN_WIDTH - 3 - 1;
+// Âûâîä ãèñòîãðàììû
+void show_histogram_text(const std::vector<size_t>& bins) {
+    size_t max_bin_count = 0;
+    for (size_t bin : bins) {
+        if (bin > max_bin_count) {
+            max_bin_count = bin;
+        }
+    }
+
+    if (max_bin_count <= MAX_ASTERISK) {
+        for (size_t bin : bins) {
+            if (bin < 10) std::cout << " ";
+            std::cout << " " << bin << "|";
+            for (size_t j = 0; j < bin; j++) {
+                std::cout << "*";
+            }
+            std::cout << std::endl;
+        }
+    } else {
+        for (size_t bin : bins) {
+            size_t height = static_cast<size_t>(MAX_ASTERISK * (static_cast<double>(bin) / max_bin_count));
+            if (bin < 100) std::cout << " ";
+            if (bin < 10) std::cout << " ";
+            std::cout << bin << "|";
+            for (size_t j = 0; j < height; j++) {
+                std::cout << "*";
+            }
+            std::cout << std::endl;
+        }
+    }
+}

text.h

@@ -0,0 +1,10 @@
+#ifndef TEXT_H_INCLUDED
+#define TEXT_H_INCLUDED
+
+#include <vector>
+using std::vector;
+
+void show_histogram_text(const std::vector<size_t>& bins);
+
+
+#endif // TEXT_H_INCLUDED

unittest.cpp

@@ -0,0 +1,38 @@
+#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("distinct negative numbers"){
+    double min = 0;
+    double max = 0;
+    find_minmax({-1, -2}, min, max);
+    CHECK(min == -2);
+    CHECK(max == -1);
+}
+TEST_CASE("vector of the same elements"){
+    double min = 0;
+    double max = 0;
+    find_minmax({3,3,3}, min, max);
+    CHECK(min == 3);
+    CHECK(max == 3);
+}
+TEST_CASE("empty vector") {
+    double min = 0;
+    double max = 0;
+    CHECK_THROWS(find_minmax({}, min, max));
+}
+
+TEST_CASE("vector of one elements"){
+    double min = 0;
+    double max = 0;
+    find_minmax({3}, min, max);
+    CHECK(min == max);
+}