The following C++ code consists of an error. What is the cause of the error? class Human{ public: virtual void speak () { cout <« "I am a human." « endl; } ; class Teacher{ public: void speak () { cout <« "I am a teach. I teach students." <« endl; } ; int main () { Human *h; Teacher t; h = &t; h -> speak () ; return 0; This is not valid to use the same function/method name in two classes. Should not use the keyword virtual in the speak() in class Human. The upcasting by creating a superclass pointer reference to the subclass is prohibited. The class Teacher is not derived from the class Human.

The following C++ code consists of an error. What is the cause of the error? class Human{ public: virtual void speak () { cout <« "I am a human." « endl; } ; class Teacher{ public: void speak () { cout <« "I am a teach. I teach students." <« endl; } ; int main () { Human *h; Teacher t; h = &t; h -> speak () ; return 0; This is not valid to use the same function/method name in two classes. Should not use the keyword virtual in the speak() in class Human. The upcasting by creating a superclass pointer reference to the subclass is prohibited. The class Teacher is not derived from the class Human.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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