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
