布爾類型-2.0

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////  ViewController.m//  OC-Design////  Created by 葛迅 on 14/9/25.////#import "ViewController.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad{    [super viewDidLoad];        BOOL areTheyDiff;    areTheyDiff = areIntsDifferent(5, 5);    NSLog(@"are %d and %d diff?%@",5,5,boolString(areTheyDiff));        areTheyDiff= areIntsDifferent(25, 35);    NSLog(@"are %d and %d diff?%@",25,35,boolString(areTheyDiff));    }BOOL areIntsDifferent(int thing1,int thing2){    if (thing1 == thing2) {        return NO;    }else{        return YES;    }}NSString *boolString(BOOL yesNo){    if (yesNo == NO) {        return @"NO";    }else{        return @"YES";    }}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end

布爾類型-2.0