//

//  main.m

//  有参 无参

//

//  Created by 赵云 on 15/7/8.

//  Copyright (c) 2015年 itcast. All rights reserved.

//

#import <Foundation/Foundation.h>

//Caculate的声明

@interface Caculate:NSObject

{

    @public;

    int _num1;          //类的属性

    int _num2;

}

//无参无返回值

-(void)sum;

//无参有返回值

-(int)sum1;

//有参无返回值

-(void)sum:(int)a and:(int)b;

//有参有返回值

-(int)sum1:(int)a and:(int)b;

@end

//Caculate的实现

@implementation Caculate

-(void)sum;

{

    NSLog(@"%d",_num1+_num2);

}

-(int)sum1{

    return _num1+_num2;

}

-(void)sum:(int)a and:(int)b{

    NSLog(@"%d",a+b);

}

-(int)sum1:(int)a and:(int)b{

    return a+b;

}

@end

int main(int argc, const char * argv[]) {

    @autoreleasepool {

     //创建第一个对象

        Caculate *cal=[Caculate new];

        cal->_num1=10;

        cal->_num2=20;

        [cal sum];

        int result=[cal sum1];

        NSLog(@"%d",result);

        [cal sum:20 and:30];

        int result2=[cal sum1:13 and:20];

        NSLog(@"%d",result2);

    }

    return 0;

}

压力好大 我才学到函数  你这我都看不懂啊