iPhone上的objective-c中的types
正如标题所说，我想询问有关iPhone上的Objective-C的基本数据types。 那么有没有什么好的文档写在这里？ 我需要表示variables的大小和variables的范围。 所以在例子中：短整型 – 2字节 – 有符号：-32768到32767和无符号：0到65535这只是一个例子。 所以，如果有人知道一个网站，请把它写在这里。 🙂
这是一个很好的概述：
http://reference.jumpingmonkey.org/programming_languages/objective-c/types.html
或者运行这个代码：
32位进程：
NSLog(@"Primitive sizes:"); NSLog(@"The size of a char is: %d.", sizeof(char)); NSLog(@"The size of short is: %d.", sizeof(short)); NSLog(@"The size of int is: %d.", sizeof(int)); NSLog(@"The size of long is: %d.", sizeof(long)); NSLog(@"The size of long long is: %d.", sizeof(long long)); NSLog(@"The size of a unsigned char is: %d.", sizeof(unsigned char)); NSLog(@"The size of unsigned short is: %d.", sizeof(unsigned short)); NSLog(@"The size of unsigned int is: %d.", sizeof(unsigned int)); NSLog(@"The size of unsigned long is: %d.", sizeof(unsigned long)); NSLog(@"The size of unsigned long long is: %d.", sizeof(unsigned long long)); NSLog(@"The size of a float is: %d.", sizeof(float)); NSLog(@"The size of a double is %d.", sizeof(double)); NSLog(@"Ranges:"); NSLog(@"CHAR_MIN: %c", CHAR_MIN); NSLog(@"CHAR_MAX: %c", CHAR_MAX); NSLog(@"SHRT_MIN: %hi", SHRT_MIN); // signed short int NSLog(@"SHRT_MAX: %hi", SHRT_MAX); NSLog(@"INT_MIN: %i", INT_MIN); NSLog(@"INT_MAX: %i", INT_MAX); NSLog(@"LONG_MIN: %li", LONG_MIN); // signed long int NSLog(@"LONG_MAX: %li", LONG_MAX); NSLog(@"ULONG_MAX: %lu", ULONG_MAX); // unsigned long int NSLog(@"LLONG_MIN: %lli", LLONG_MIN); // signed long long int NSLog(@"LLONG_MAX: %lli", LLONG_MAX); NSLog(@"ULLONG_MAX: %llu", ULLONG_MAX); // unsigned long long int 当在iPhone 3GS上运行（iPod Touch和更老的iPhone应该得到相同的结果）时，您会得到：
Primitive sizes: The size of a char is: 1. The size of short is: 2. The size of int is: 4. The size of long is: 4. The size of long long is: 8. The size of a unsigned char is: 1. The size of unsigned short is: 2. The size of unsigned int is: 4. The size of unsigned long is: 4. The size of unsigned long long is: 8. The size of a float is: 4. The size of a double is 8. Ranges: CHAR_MIN: -128 CHAR_MAX: 127 SHRT_MIN: -32768 SHRT_MAX: 32767 INT_MIN: -2147483648 INT_MAX: 2147483647 LONG_MIN: -2147483648 LONG_MAX: 2147483647 ULONG_MAX: 4294967295 LLONG_MIN: -9223372036854775808 LLONG_MAX: 9223372036854775807 ULLONG_MAX: 18446744073709551615
64位进程：
The size of a char is: 1. The size of short is: 2. The size of int is: 4. The size of long is: 8. The size of long long is: 8. The size of a unsigned char is: 1. The size of unsigned short is: 2. The size of unsigned int is: 4. The size of unsigned long is: 8. The size of unsigned long long is: 8. The size of a float is: 4. The size of a double is 8. Ranges: CHAR_MIN: -128 CHAR_MAX: 127 SHRT_MIN: -32768 SHRT_MAX: 32767 INT_MIN: -2147483648 INT_MAX: 2147483647 LONG_MIN: -9223372036854775808 LONG_MAX: 9223372036854775807 ULONG_MAX: 18446744073709551615 LLONG_MIN: -9223372036854775808 LLONG_MAX: 9223372036854775807 ULLONG_MAX: 18446744073709551615
请注意，您也可以在Objective-C中完美地使用C99固定宽度types：
#import <stdint.h> ... int32_t x; // guaranteed to be 32 bits on any platform
如果你没有C标准的副本，那么维基百科页面就可以很好地描述这个头文件中的内容（不过，因为Objective-C只是C的一个小扩展）。 你也可以find头文件limits.h和inttypes.h是有用的。
更新新的64位拱门
Ranges: CHAR_MIN: -128 CHAR_MAX: 127 SHRT_MIN: -32768 SHRT_MAX: 32767 INT_MIN: -2147483648 INT_MAX: 2147483647 LONG_MIN: -9223372036854775808 LONG_MAX: 9223372036854775807 ULONG_MAX: 18446744073709551615 LLONG_MIN: -9223372036854775808 LLONG_MAX: 9223372036854775807 ULLONG_MAX: 18446744073709551615
