第二次作业。

OOP/02/Optional02.cpp

@@ -0,0 +1,47 @@
+#include <iostream>
+#include <stdlib.h>
+
+class Strings {
+public:
+    Strings(char *s);
+    ~Strings();
+    void Print();
+    void Set(char *s);
+
+private:
+    int length;
+    char *str;
+};
+
+Strings::Strings(char *s) {
+    length = strlen(s);
+    str = (char *)malloc(length + 1);
+    strcpy(str, s);
+}
+
+Strings::~Strings() {
+    free(str);
+}
+
+void Strings::Print() {
+    std::cout << str << std::endl;
+}
+
+void Strings::Set(char *s) {
+    free(str);
+    length = strlen(s);
+    str = (char *)malloc(length + 1);
+    strcpy(str, s);
+}
+
+int main() {
+    Strings* str1 = new Strings("didig");
+    Strings* str2 = new Strings("dirir");
+
+    str1->Print();
+    str2->Print();
+    str1->Set("ifirk");
+    str1->Print();
+
+    return 0;
+}