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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![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.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4c8e9d97-8ce7-467f-b74a-80df220f2e54%2F318e598e-5ae5-4858-9236-c8531e8400cf%2Fyfxnt2_processed.jpeg&w=3840&q=75)
Transcribed Image Text: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.
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