李洪强iOS开发之计算数组的最大最小值

//

//  ViewController.m

//  A21 - 李洪强 - 输出参数

//

//  Created by vic fan on 16/7/3.

//  Copyright © 2016年 李洪强. All rights reserved.

//

//      计算数组的最大最小值

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

int a;

int b;

NSArray *numbers = @[@(50),@(80),@(10),@(30)];

[self getMaxAndMin:numbers max:&a min:&b];

NSLog(@"最大值: %d,最小值: %d",a,b);

NSString *str = nil;

[self test:&str];

NSLog(@"%@",str);

}

- (void)test:(NSString **)str{

*str = @"abc";

}

//计算数组的最大值,最小值,平均值

- (void)getMaxAndMin:(NSArray *)numbers max:(int*)max min:(int*)min{

//假设一个值是最大或者最小值,然后跟数组中的每个数进行比较

//假设的最大值

*max = [numbers[0] intValue];

//假设的最小值

*min = [numbers[0] intValue];

for (NSNumber *num in numbers) {

//判断最大值

if(*max < num.intValue){

*max = num.intValue;

}

//判断最小值

if(*min > num.intValue){

*min = num.intValue;

}

}

}

- (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

@end