[C++] โครงสร้างเบื้องต้น

โปรแกรมที่ใช้ Dev C++

C++ supports

the concepts of OOP: data abstraction, data encapsulation, inheritance, polymorphism
Extensions: exception handling, templates

ตัวอย่าง

Ex1 Basic structure

#include <iostream>
using namespace std;
int main()
{
 cout << "Enjoy yourself with C++!" << endl;
 return 0;
}

คำอธิบาย

# indicates that the line is intended for the preprocessor.
#include <filename> allows the program access to all the information contained in the header file.
Predefined names in C++ are to be found in the std (standard) namespace. The using directive allows direct access to the names of the std namespace.
The name cout (console output) designates an object responsible for output.
<<, characters are being “pushed” to the output stream. endl (end of line) causes a line feed.
returning a value of 0 as an exit code to the calling program.

Ex2 Prototype (Function)

#include <iostream>
using namespace std;

void line(), message(); // Prototypes
int main() {
 cout << "Hello! The program starts in main()." << endl;
 line();
 message();
 line();
 cout << "At the end of main()." << endl;
 return 0;
}
void line() {
 cout << "--------------------------------" << endl;
}
void message() {
 cout << "In function message()." << endl;
}

Verzaru's Notes

[C++] โครงสร้างเบื้องต้น