Solved ex 4

1 files changed, 37 insertions, 1 deletions

diff --git a/Year 1/Programming introduction/Homeworks/homework1.cpp b/Year 1/Programming introduction/Homeworks/homework1.cpp
index f4ca9b9..c6832ad 100644
--- a/Year 1/Programming introduction/Homeworks/homework1.cpp
+++ b/Year 1/Programming introduction/Homeworks/homework1.cpp
@@ -69,6 +69,42 @@ void ex2() {
 	cout << "Шипков мармалад: " << rosehipMarmalades << endl;
 }
 
+/*
+ * Exercise 4
+ */
+
+bool isInteresting(int n) {
+	int lastDigit;
+
+	do {
+		lastDigit = n % 10;
+		n /= 10;
+
+		if ((lastDigit & 1) == ((n % 10) & 1))
+			return false;
+	} while (n != 0);
+
+	return true;
+}
+
+int sumOfInterestingNumsBetween(int a, int b) {
+	int sum = 0;
+
+	for (int i = a; i <= b; i++) {
+		if (isInteresting(i))
+			sum += i;
+	}
+
+	return sum;
+}
+
+void ex4() {
+	int a, b;
+	cin >> a >> b;
+
+	cout << sumOfInterestingNumsBetween(a, b) << endl;
+}
+
 int main() {
-	ex2();
+	ex4();
 }