build:6 вариант

main.cpp

@@ -34,6 +34,12 @@ input_data(){
     cerr << "Enter bin count: ";
     cin >> in.bin_count;
 
+    cerr << "Enter color: ";
+    cin >> in.stroke;
+
+    cerr << "Enter color to fill: ";
+    cin >> in.fill;
+
     return in;
 }
 
@@ -42,6 +48,6 @@ int main()
 
     auto in = input_data();
     std::vector<size_t> bins = make_histogram(in.numbers, in.bin_count);
-    show_histogram_svg(bins);
+    show_histogram_svg(bins, in.stroke, in.fill);
     return 0;
 }

svg.cpp

@@ -31,7 +31,7 @@ svg_rect(double x, double y, double width, double height, string stroke = "chart
 }
 
 void
-show_histogram_svg(const vector<size_t>& bins) {
+show_histogram_svg(const vector<size_t>& bins, string stroke, string fill) {
     const auto IMAGE_WIDTH = 400;
     const auto IMAGE_HEIGHT = 300;
     const auto TEXT_LEFT = 20;
@@ -51,7 +51,7 @@ show_histogram_svg(const vector<size_t>& bins) {
     for (size_t bin : bins) {
         const double bin_width = (( IMAGE_WIDTH - TEXT_WIDTH ) / BLOCK_WIDTH ) * ( bin / maxel );
         svg_text(TEXT_LEFT, top + TEXT_BASELINE, to_string(bin));
-        svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT);
+        svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT, stroke, fill);
         top += BIN_HEIGHT;
     }
     svg_end();

svg.h

@@ -3,5 +3,5 @@
 #include <vector>
 
 void
-show_histogram_svg(const std::vector<size_t>& bins);
+show_histogram_svg(const std::vector<size_t>& bins, std::string stroke, std::string fill);