added double jump and sitting state

term1/seminar01_overload/06_is_expensive/is_expensive.cpp

@@ -0,0 +1,20 @@
+#include <iostream>
+using std::cout, std::endl;
+
+struct Book {
+    char title[100];
+    int pages;
+    float price;
+};
+
+bool isExpensive(const Book& b) {
+    if (b.price > 1000) {
+        return true;
+    }
+    return false;
+}
+
+int main() {
+    Book b = {"One Hundred Years of Solitude", 456, 1200};
+    cout << isExpensive(b) << endl;
+}