Objective-C 常用資料類型

基礎資料型別 (Elementary Data Type)

 

1. int
輸出格式符：%i, %d, %o %x, 

2. float
輸出格式符：%f, %e, %g

3. double
輸出格式符：%f, %e, %g

4. char

輸出格式符：%c

 

限定符：

1. long
long int: %li
long double: %Lf
形成long int通過在數字後面加L.
long int number = 123324123234123L;

2. long long
long long int: %lli

3. short
short int: %hi

4. unsigned

5. signed

 

它們各自所佔的位元組數

 

#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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