ввод из произвольного потока

main.cpp

@@ -15,30 +15,34 @@ struct Input
 };
 
 Input
-input_data()
+input_data(istream& in, bool promt)
 {
-    Input in;
+    Input ik;
 
+    size_t number_count;
+    if (promt)
+    {
         cerr<<"Marks: ";
-    cin>>in.number_count;
+    }
+    in>>ik.number_count;
 
 
-    in.numbers.resize(in.number_count);
-    for (size_t i=0; i<in.number_count; i++)
+    ik.numbers.resize(ik.number_count);
+    for (size_t i=0; i<ik.number_count; i++)
     {
         cerr<<"numbers["<<i<<"]=";
-        cin>>in.numbers[i];
+        in>>ik.numbers[i];
     }
 
     cerr<<"Kol_kor: ";
-    cin>>in.kol_kor;
-    return in;
+    in>>ik.kol_kor;
+    return ik;
 }
 
 int main()
 {
     size_t number_count;
-    auto in = input_data();
+    auto in = input_data(cin,true);
     auto B = make_histogram(in.numbers, in.kol_kor);
     show_histogram_svg(B, in.number_count);