Objective-C中還有其他一些重要的運算符，包括sizeof和?:三元運算符，Objective-C語言也都支持。
| 運算符 | 描述 | 示例 |
|---|---|---|
sizeof() |
返回變數的大小 | sizeof(a), 這裏如果變數a是整數，則將返回：4。 |
& |
返回變數的地址。 | &a將返回變數的實際地址。 |
* |
指向變數的指針。 | *a將指向變數。 |
? : |
條件運算式 | 如果條件為真？然後是X值：否則為Y值 |
例子
嘗試以下示例來瞭解Objective-C編程語言中可用的所有其他運算符 -
#import <Foundation/Foundation.h>
int main() {
int a = 4;
short b;
double c;
int* ptr;
/* example of sizeof operator */
NSLog(@"Line 1 - Size of variable a = %d\n", sizeof(a) );
NSLog(@"Line 2 - Size of variable b = %d\n", sizeof(b) );
NSLog(@"Line 3 - Size of variable c= %d\n", sizeof(c) );
/* example of & and * operators */
ptr = &a; /* 'ptr' now contains the address of 'a'*/
NSLog(@"value of a is %d\n", a);
NSLog(@"*ptr is %d.\n", *ptr);
/* example of ternary operator */
a = 10;
b = (a == 1) ? 20: 30;
NSLog(@"Value of b is %d\n", b );
b = (a == 10) ? 20: 30;
NSLog(@"Value of b is %d\n", b );
}
執行上面示例代碼，得到以下結果：
2018-11-14 05:18:49.270 main[174436] Line 1 - Size of variable a = 4
2018-11-14 05:18:49.271 main[174436] Line 2 - Size of variable b = 2
2018-11-14 05:18:49.271 main[174436] Line 3 - Size of variable c= 8
2018-11-14 05:18:49.271 main[174436] value of a is 4
2018-11-14 05:18:49.271 main[174436] *ptr is 4.
2018-11-14 05:18:49.272 main[174436] Value of b is 30
2018-11-14 05:18:49.272 main[174436] Value of b is 20
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