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基本数据类型
1. int
输出格式符：%i, %d, %o %x,2. float
输出格式符：%f, %e, %g
3. double
输出格式符：%f, %e, %g
输出格式符：%c
限定符：
1. long
long int: %li
long double: %Lf
形成long int通过在数字后面加L.
long int number = 123324123234123L;
2. long long
long long int: %lli
3. short
short int: %hi
4. unsigned
5. signed
它们各自所占的字节数
#import <Foundation/Foundation.h>
int main (int argc, const char * argv[]) {
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
NSLog(@"The size of an int is: %d bytes.",sizeof(int));
NSLog(@"The size of a short int is: %d bytes.",sizeof(short int));
NSLog(@"The size of a long int is: %d bytes.",sizeof(long int));
NSLog(@"The size of a char is: %d bytes.",sizeof(char));
NSLog(@"The size of a float is: %d bytes.",sizeof(float));
NSLog(@"The size of a double is: %d bytes.",sizeof(double));
NSLog(@"The size of a bool is: %d bytes.",sizeof(bool));
[pool drain];
return 0;
}
2011-08-21 09:29:16.475 sizeofTest[860:903] The size of an int is: 4 bytes.
2011-08-21 09:29:16.478 sizeofTest[860:903] The size of a short int is: 2 bytes.
2011-08-21 09:29:16.478 sizeofTest[860:903] The size of a long int is: 8 bytes.
2011-08-21 09:29:16.479 sizeofTest[860:903] The size of a char is: 1 bytes.
2011-08-21 09:29:16.479 sizeofTest[860:903] The size of a float is: 4 bytes.
2011-08-21 09:29:16.479 sizeofTest[860:903] The size of a double is: 8 bytes.
2011-08-21 09:29:16.480 sizeofTest[860:903] The size of a bool is: 1 bytes.
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转自：http://www.cnblogs.com/getsun/archive/2011/08/21/2147618.html