Objective-c类型大小(值域)

This is a good overview:

http://reference.jumpingmonkey.org/programming_languages/objective-c/types.html

or run this code

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 intNSLog(@"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 intNSLog(@"LONG_MAX:   %li",  LONG_MAX);NSLog(@"ULONG_MAX:  %lu",  ULONG_MAX);   // unsigned long intNSLog(@"LLONG_MIN:  %lli", LLONG_MIN);   // signed long long intNSLog(@"LLONG_MAX:  %lli", LLONG_MAX);NSLog(@"ULLONG_MAX: %llu", ULLONG_MAX);  // unsigned long long int 

When run on an iPhone 3GS (iPod Touch and older iPhones should yield the same result) you get:

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:   -128CHAR_MAX:   127SHRT_MIN:   -32768SHRT_MAX:   32767INT_MIN:    -2147483648INT_MAX:    2147483647LONG_MIN:   -2147483648LONG_MAX:   2147483647ULONG_MAX:  4294967295LLONG_MIN:  -9223372036854775808LLONG_MAX:  9223372036854775807ULLONG_MAX: 18446744073709551615