(new) code: Добавлен универсальный поток для чтения

fin_lab34.cpp

@@ -16,7 +16,7 @@ struct Input{
 };
 
 Input
-input_data(){
+input_data(istream &thread){
     size_t number_count;
     cin >> number_count;
     Input in;
@@ -32,11 +32,13 @@ int
 main(){
     double min = 0, max = 0;
     size_t font = 0;
-    Input in = input_data();
+    auto in = input_data(cin);
     auto bins = make_histogram(in.numbers, in.bin_count);
     //for (auto now: bins) {cout << now << endl;}
     cin >> font;
-    show_histogram_svg(bins, font);
+    if (font < 8) {cerr << "Font value is too small. Please, edit the input file.";}
+    else if (font > 32) {cerr << "Font value is too large. Please, edit the input file.";}
+    else {show_histogram_svg(bins, font);}
     return 0;
 }