首页 › OC/Swift › 第四讲：什么叫做“类”之构造函数

Sian 发表于 2013-12-12 22:33:27

第四讲：什么叫做“类”之构造函数

Fraction.h
#import <Foundation/NSObject.h>

@interface Fraction: NSObject
{
    int numerator;
    int denominator;
}

-(void) print;
-(void) setNumerator: (int) n;
-(void) setDenominator: (int) d;
-(int) numerator;
-(int) denominator;
-(void) setNumerator: (int) n andDenominator: (int) d;
//****************************************************
-(Fraction*) initWithNumerator:(int)n denominator: (int) d;
//****************************************************
@end

Fraction.m
#import "Fraction.h"
#import <stdio.h>
@implementation Fraction
-(void) print
{
    printf("%i/%i",numerator,denominator);
}

-(void) setNumerator: (int) n
{   
    numerator = n;
}
-(void) setDenominator: (int) d
{   
    denominator = d;
}

-(int) denominator
{   
    return denominator;
}
-(int) numerator
{   
    return numerator;
}

-(void) setNumerator: (int) n andDenominator: (int) d
{
    numerator = n;
    denominator = d;
}
//**********************************************************
-(Fraction*) initWithNumerator: (int) n denominator: (int) d
{
    self = ;
    if ( self ) {
    ;
    }
    return self;
}
//**********************************************************
@end

main.m
#import <stdio.h>
#import "Fraction.h"
int main( int argc, const char *argv[] )
{
    Fraction *frac = [ init];
    ;
    ;
    printf( "The fraction is: " );
    ;
    ;
    Fraction *frac2 = [ init];
    ;
    printf( "Fraction 2 is: " );
    ;
    ;
//***************************************************
    Fraction *frac3 = [ initWithNumerator: 3 denominator: 10];
    printf( "Fraction 3 is: " );
    ;
    ;
//***************************************************

    return 0;
}

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