code: refactoring

histogram.cpp

@@ -1,18 +1,26 @@
 #include "histogram.h"
 
-void
+bool
 find_minmax(const std::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;
+    if (numbers.size() != 0) {
+        min = numbers[0];
+        max = numbers[0];
+
+        for (double x : numbers) {
+            if (x < min) {
+                min = x;
+            }
+            else if (x > max) {
+                max = x;
+            }
         }
+        return true;
     }
+
+    else {
+        return false;
+    }
+
 }
 
 

histogram_internal.h

@@ -3,8 +3,7 @@
 #include <vector>
 #include <string>
 
-void
-find_minmax(const std::vector<double>& numbers, double& min, double& max);
+bool find_minmax(const std::vector<double>& numbers, double& min, double& max);
 
 std::string
 bin_color(size_t bin, size_t max_count);

main.cpp

@@ -11,29 +11,32 @@ using namespace std;
     };
 
 Input
-input_data(){
+input_data(istream& in, bool prompt){
+
+    if (prompt == true) cerr << "Enter number_count: ";
 
     size_t number_count;
-    cerr << "Enter number_count: ";
-    cin >> number_count;
+    in >> number_count;
+
+    Input data;
+    data.numbers.resize(number_count);
+
+    if (prompt == true) cerr << "Enter numbers: ";
 
-    Input in;
-    in.numbers.resize(number_count);
-    cerr << "Enter numbers: ";
     for (size_t i = 0; i < number_count; i++){
-        cin >> in.numbers[i];
+        in >> data.numbers[i];
     }
 
-    cerr << "Enter bin count: ";
-    cin >> in.bin_count;
+    if (prompt == true) cerr << "Enter bin count: ";
 
-    return in;
+    in >> data.bin_count;
+    return data;
 }
 
 int
 main()
 {
-    auto in = input_data();
+    auto in = input_data(cin, false);
     auto bins = make_histogram(in.numbers, in.bin_count);
     show_histogram_svg(bins);
     return 0;

my_project.cbp

@@ -39,6 +39,10 @@
 		<Unit filename="mainmain.c">
 			<Option compilerVar="CC" />
 		</Unit>
+		<Unit filename="svg.cpp" />
+		<Unit filename="svg.h">
+			<Option target="&lt;{~None~}&gt;" />
+		</Unit>
 		<Unit filename="text.cpp" />
 		<Unit filename="text.h" />
 		<Extensions />

svg.cpp

@@ -28,9 +28,9 @@ svg_rect(double x, double y, double width, double height, string stroke, string
     cout << "<rect x = '" << x << "' y = '" << y << "' width = '" << width << "' height = '" << height << "' stroke = '" << stroke << "' fill = '" << fil << "' />";
 }
 
-string bin_color(size_t bin, size_t max_count){
-    return ("#" + to_string(10 - (bin * 9) / max_count) + to_string(10 - (bin * 9) / max_count) + to_string(10 - (bin * 9) / max_count));
-}
+//string bin_color(size_t bin, size_t max_count){
+//    return ("#" + to_string(10 - (bin * 9) / max_count) + to_string(10 - (bin * 9) / max_count) + to_string(10 - (bin * 9) / max_count));
+//}
 
 void
 show_histogram_svg(const vector<size_t>& bins) {
@@ -53,9 +53,9 @@ show_histogram_svg(const vector<size_t>& bins) {
     double top = 0;
     for (size_t bin : bins) {
         const double bin_width = (IMAGE_WIDTH - TEXT_WIDTH) * bin / max_count;
-        const auto color = bin_color(bin,max_count);
+        //const auto color = bin_color(bin,max_count);
         svg_text(TEXT_LEFT, top + TEXT_BASELINE, to_string(bin));
-        svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT,"grey", color);
+        svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT,"red", "#ffeeee");
         top += BIN_HEIGHT;
     }
     svg_end();

unittest.cbp

@@ -31,6 +31,11 @@
 		<Compiler>
 			<Add option="-Wall" />
 		</Compiler>
+		<Unit filename="doctest.h" />
+		<Unit filename="histogram.cpp" />
+		<Unit filename="histogram_internal.h" />
+		<Unit filename="svg.cpp" />
+		<Unit filename="unittest.cpp" />
 		<Extensions>
 			<lib_finder disable_auto="1" />
 		</Extensions>

unittest.cpp

@@ -13,6 +13,37 @@ TEST_CASE("distinct positive numbers") {
     CHECK(max == 2);
 }
 
+TEST_CASE("one element vector") {
+    double min = 0;
+    double max = 0;
+    find_minmax({1}, min, max);
+    CHECK(min == max);
+}
+
+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("identical elements vector") {
+    double min = 0;
+    double max = 0;
+    find_minmax({3,3,3,3}, min, max);
+    CHECK(min == 3);
+    CHECK(max == 3);
+}
+
+TEST_CASE("empty vector") {
+    double min = 0;
+    double max = 0;
+    bool result = find_minmax({}, min, max);
+    CHECK(result == false);
+}
+
 TEST_CASE("bin color") {
     size_t max_bin = 10;
     size_t min_bin = 3;