code: добавлен unittest и подгружены недостающие файлы

histogram.cpp

@@ -2,52 +2,35 @@
 #include <vector>
 #include "histogram.h"
 
-void find_minmax(const std::vector<double> &numbers, double &min, double &max)
-{
-    //min = numbers[0];
-    //max = numbers[0];
-    for (double x : numbers)
-    {
-
-        if (x < min)
-        {
+void 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)
-        {
+        } else if ( x > max ){
             max = x;
         }
     }
 }
 
-std::vector<int> make_histogram(const std::vector<double>& numbers, size_t bin_count)
-{
-    std::vector<int> bins(bin_count);
-    int max_count = bins[0];
+std::vector<std::size_t> make_histogram(const std::vector<double> &numbers, std::size_t bin_count) {
     double min = numbers[0];
     double max = numbers[0];
-
     find_minmax(numbers, min, max);
     double bin_size = ( max - min ) / bin_count;
-
-    for (size_t i = 0; i < numbers.size(); i++)
-    {
+    std::vector<std::size_t> bins ( bin_count );
+    for (std::size_t i=0; i <  numbers.size(); i++ ){
         bool found = false;
-        for (size_t j = 0; (j < bin_count - 1) && !found; j++)
-        {
+        for (std::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))
-            {
+            if (lo <= numbers[i] && ( numbers[i] < hi )){
                 bins[j]++;
                 found = true;
             }
         }
-
-        if (!found)
-        {
+        if ( !found ){
             bins[bin_count-1]++;
         }
     }

histogram_internal.h

@@ -0,0 +1,8 @@
+#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

unittest.cpp

@@ -0,0 +1,12 @@
+#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);
+}