BOOL party

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。