code: добавил histogram_internal.h

histogram_internal.h

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