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Technology
Learning C Language
C Syntax
C++ SyntaxC is based on library network which means many fundamental functions for digital processing is already build in. Also, any one can write a new function and register it to include in the library. All functions are stored in the header (*.h) file. Here's the example of <stdio.h> included in a program:
/*This is a printme.cpp which uses print.*/ function */
#include <stdio.h>
main(void)
{
printf("Hello world!");
return 0;
}
This program displays the "Hello world " message on the command line. The program needs to be compiled and then execute from the command line of DOS prompt. The file which is include <stdio.h> does all work for the print function. Programmmers do not need to be worried about writing the subroutine for the print function. Its already written and registered in the library of C compiler.
Here's another header file that does math functions:
#include <stdio.h>
#include <math.h>
int main(void)
{
double answer;answer = sqrt(10.0);
printf("%f", answer);return 0;
}
In this program <math.h> does the squaring of the value 10.00 as double data type variable answer.
C++ Syntax:
C++ is a fully developed object oriented programming language though it has evolved from C. C++ includes all the library and thier functions. In addition, C++ can create objects as class, inherit its property and methods in another class. There's a lot of information on the Internet if you are interested. Just type C++ in one of the search engine's text box and submit it. Here are some syntax samples:
/*This is a hell.cpp file that uses C++ iostream.h header file*/
#include <iostream.h>
void main()
{
cout <<"Hello world";
}
Here's program that creats object as class:
/*This increment.cpp file which has class as public */
#include <iostream.h>
class Increment {
public:
Increment(int c = 0, int i = 1);
void addIncrement() {count += increment; }
void print() const;
private:
int count;
const int increment;
};
Increment::Increment(int c, int i) : increment(i)
{count = c;}
void Increment::print() const
{
cout <<"count = " << count<<", increment = " << increment << endl;
}
main()
{
Increment value(10, 5);
cout <<"Before increment: ";
value.print();
for(int j=1; j<=3; j++){
void.addIncrement();
cout<<"After increment "<<j <<": ";
value.print();
}
return 0;
}Find the information on the Internet or from a book and figure it out for yourself what does this program do and understand each syntax and class variables.
C++ is a very highly sophiscated object oriented programming language. Most of the great databases such as Oracle, Cybase, DB, SQL Server are developed by C++. Operating system like Unix, Windows NT, Windows 98 and Windows 2000 are developed by C++. It is a language on which all the modern software industries depend on to develop their product from games to the operating systems.
As in Visual Basic you can also develop ADO and RDS components with the C++ language. Unlike Visual Basic C++ is not only for the windows application development but also for developing applications for any other operating systems such as Unix, Linux, Macintosh.
