BOOL party

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如同上文，新建一个工程名为“BOOL Party”。修改代码如下：

////  main.m//  BOOL party////  Created by cloud on 13-3-3.//  Copyright (c) 2013年 cloud. All rights reserved.//#import <Foundation/Foundation.h>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");    }}int main(int argc, const char * argv[]){    @autoreleasepool {                // insert code here...        BOOL areTheyDifferent;        areTheyDifferent=areIntsDifferent(5, 5);        NSLog(@"are %d and %d different? %@",5,5,boolString(areTheyDifferent));                        areTheyDifferent=areIntsDifferent(23, 42);        NSLog(@"are %d and %d different? %@",23,42,boolString(areTheyDifferent));    }    return 0;}

然后点Run运行，结果如下：

这个例子，说明了Object-C中BOOL变量的使用。另外，Xcode中复制、粘贴是Command+C，Command+V。