diff --git a/main.cpp b/main.cpp
index 29a0767..f5aa593 100644
--- a/main.cpp
+++ b/main.cpp
@@ -15,26 +15,31 @@ struct Input {
 };
 
 Input
-input_data() {
+input_data(istream& in, bool prompt = true){
 	size_t number_count;
-	Input in;
-	cerr << "Enter number_count ";
-	cin >> number_count;
+	Input iiin;
+	if (prompt == true) {
 
-	in.numbers.resize(number_count);
-	cerr << "Enter numbers ";
-	for (int i = 0; i < number_count;i++) {
-		cin >> in.numbers[i];
+		cerr << "Enter number_count ";
 	}
+	in >> number_count;
 
-	cerr << "Enter bin count \n";
-	cin >> in.bin_count;
-
-	return in;
+	iiin.numbers.resize(number_count);
+	if (prompt == true) {
+		cerr << "Enter numbers ";
+	}
+	for (int i = 0; i < number_count;i++) {
+		in >> iiin.numbers[i];
+	}
+	if (prompt == true) {
+		cerr << "Enter bin count \n";
+		in >> iiin.bin_count;
+	}
+	return iiin;
 }
 
 int main() {
-	Input in = input_data();
+	Input in = input_data(cin);
 	auto bins = make_histogram(in.numbers, in.bin_count);
 	show_histogram_svg(bins);
 	return 0;