Objective-C实例方法之多个参数声明与调用

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类接口文件(MathDiv.h)

#import <Foundation/Foundation.h>

//Define the Fraction class

@interface Fraction: NSObject
{
int dividend;
int divider;
}

@property int dividend, divider;

-(void) print;
-(void) setTo:(int)n over:(int)d;
-(double) convertToNum;

@end

类实现文件(MathDiv.m)

#import "Fraction.h"

@implementation Fraction

@synthesize dividend, divider;

-(void) print
{
    NSLog (@"%i/%i", dividend, divider);
}

-(double) convertToNum
{
    if (divider != 0)
        return (double)dividend/divider;
    else
        return 0.0;
}

-(void) setTo:(int)n over: (int)d
{
    dividend = n;
    divider = d;
}

@end

主程序调用

#import "Fraction.h"

int main(int argc, const char * argv[])
{
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    Fraction *aFraction = [[Fraction alloc] init];

    [aFraction setTo: 100 over: 200];
    [aFraction print];

    [aFraction setTo: 1 over: 3];
    [aFraction print];

    [aFraction release];
  [pool drain];

    return 0;
}

运行结果:

100/200

1/3