echo.cpp added

+#include <iostream>
+using namespace std;
+
+int main() {
+	int num;
+	cout << "¼ýÀÚ¸¦ ÀÔ·ÂÇϼ¼¿ä: ";
+	cin >> num;
+
+	cout << num;
+
+	return 0;
+}
\ No newline at end of file