code: added stream

histogram.cpp

@@ -3,8 +3,12 @@
 #include <iostream>
 using namespace std;
 
-void
+bool
 find_minmax(const vector<double>& numbers, double& min, double& max) {
+	if (numbers.empty()) {
+		return false;
+	}
+
 	min = numbers[0];
 	max = numbers[0];
 	for (double x : numbers) {
@@ -15,6 +19,8 @@ find_minmax(const vector<double>& numbers, double& min, double& max) {
 			max = x;
 		}
 	}
+
+	return true;
 }
 
 std::vector<double>

histogram_internal.h

@@ -1,4 +1,4 @@
 #pragma once
 #include <vector>
-void
+bool
 find_minmax(const std::vector<double>& numbers, double& min, double& max);

main.cpp

@@ -21,42 +21,42 @@ input_data() {
     cerr << "Enter number count: ";
     cin >> number_count;
 
-    Input in;
+    Input in1;
-    in.numbers.resize(number_count);
+    in1.numbers.resize(number_count);
     cerr << "Enter numbers: ";
     for (size_t i = 0; i < number_count; i++) {
-        cin >> in.numbers[i];
+        cin >> in1.numbers[i];
     }
 
     cerr << "Enter bin count: ";
-    cin >> in.bin_count;
+    cin >> in1.bin_count;
 
  
     cerr << "Enter stroke colour without spaces or in code format:";
     cin.ignore();
-    getline(cin, in.stroke);
+    getline(cin, in1.stroke);
 
-    for (i = 0; i < in.stroke.length(); i++) {
+    for (i = 0; i < in1.stroke.length(); i++) {
-        if (isspace(in.stroke[i])) {
+        if (isspace(in1.stroke[i])) {
             cerr << "invalid input";
             exit(0);
         }
     }
-    if (in.stroke[0] == check2[0]) {
+    if (in1.stroke[0] == check2[0]) {
-        if (in.stroke.length() != 7) {
+        if (in1.stroke.length() != 7) {
             cerr << "invalid input";
             exit(0);
         }
     }
-    return in;
+    return in1;
 }
 
 int main()
 {
     const size_t SCREEN_WIDTH = 80;
     const size_t MAX_ASTERISK = SCREEN_WIDTH - 3 - 1;
-    auto in = input_data();
+    auto in1 = input_data();
-    auto bins = make_histogram(in.numbers, in.bin_count);
+    auto bins = make_histogram(in1.numbers, in1.bin_count);
-    show_histogram_svg(bins, in.stroke);
+    show_histogram_svg(bins, in1.stroke);
     return 0;
 }

unittest.cpp

@@ -13,9 +13,7 @@ TEST_CASE("distinct positive numbers") {
 TEST_CASE("empty vector") {
 	double min = 0;
 	double max = 0;
-	find_minmax({NULL}, min, max);
+	CHECK(!find_minmax({}, min, max));
-	CHECK(min == 0);
-	CHECK(max == 0);
 }
 TEST_CASE("one element") {
 	double min = 0;