Objective-C 常用数据类型

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

4. char

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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