Mac OS X和IOS上基本数据类型的字节数

在Mac和Iphone上分别运行下面的程序:

NSLog(@"char size = %lu", sizeof(char));
NSLog(@"short int size = %lu", sizeof(short));
NSLog(@"int size = %lu", sizeof(int));
NSLog(@"long int size = %lu", sizeof(long));
NSLog(@"long long int size = %lu", sizeof(long long));
NSLog(@"float size = %lu", sizeof(float));
NSLog(@"double size = %lu", sizeof(double));
NSLog(@"pointer size = %lu", sizeof(int *));
NSLog(@"BOOL size = %lu", sizeof(BOOL));
NSLog(@"NSInteger size = %lu", sizeof(NSInteger));

Mac上的输出为:



Iphone上的输出为:



从输出上可以看到，无论Mac OS X平台还是Iphone平台，int都是32位，long和pointer都是64位，因此，Mac OS X和Iphone都是LP64的。