Programming in C

416 Chapter 19 Object-Oriented Programming

printf ("The value of the fraction is %i/%i\n", numerator, denominator);

}

@end

//------- program section -------

int main (void)

{

Fraction *myFract;

myFract = [Fraction new];

[myFract setNumerator: 1];

[myFract setDenominator: 3];

printf ("The numerator is %i, and the denominator is %i\n",

[myFract numerator], [myFract denominator]);

[myFract print]; // use the method to display the fraction

[myFract free];

return 0;

}

Program 19.2 Output

The numerator is 1, and the denominator is 3

The value of the fraction is 1/3

As you can see from the comments in Program 19.2, the program is logically divided

into three sections: the @interface section, the @implementation section, and the pro-

gram section.These sections are typically placed in separate files.The @interface section

is usually put into a header file that gets included in any program that wants to work

with that particular class. It tells the compiler what variables and methods are contained

in the class.

The @implementation section contains the actual code that implements these meth-

ods. Finally, the program section contains the program code to carry out the intended

purpose of the program.

Program 19.2 Continued