Show 例子
Objective-C语言支持以下赋值运算符 -
| 操作者 | 描述 | 例 |
|---|---|---|
| = | 简单赋值运算符，将右侧操作数的值分配给左侧操作数 | C = A + B将A + B的值分配给C |
| += | 添加AND赋值运算符，它将右操作数添加到左操作数并将结果赋给左操作数 | C + = A等于C = C + A. |
| -= | 减去AND赋值运算符，它从左操作数中减去右操作数，并将结果赋给左操作数 | C - = A相当于C = C - A. |
| *= | 乘以AND赋值运算符，它将右操作数与左操作数相乘，并将结果赋给左操作数 | C * = A等于C = C * A. |
| /= | 除以AND赋值运算符，它将左操作数除以右操作数，并将结果赋给左操作数 | C/= A相当于C = C/A. |
| %= | 模数AND赋值运算符，它使用两个操作数获取模数，并将结果赋给左操作数 | C％= A等于C = C％A |
| <<= | 左移AND赋值运算符 | C << = 2与C = C << 2相同 |
| >>= | 右移AND赋值运算符 | C >> = 2与C = C >> 2相同 |
| &= | 按位AND赋值运算符 | C＆= 2与C = C＆2相同 |
| ^= | 按位异或和赋值运算符 | C ^ = 2与C = C ^ 2相同 |
| |= | 按位包含OR和赋值运算符 | C | = 2与C = C |相同 2 |
例子 (Example)
尝试以下示例来了解Objective-C编程语言中可用的所有赋值运算符 -
#import <Foundation/Foundation.h>
int main() {
int a = 21;
int c ;
c = a;
NSLog(@"Line 1 - = Operator Example, Value of c = %d\n", c );
c += a;
NSLog(@"Line 2 - += Operator Example, Value of c = %d\n", c );
c -= a;
NSLog(@"Line 3 - -= Operator Example, Value of c = %d\n", c );
c *= a;
NSLog(@"Line 4 - *= Operator Example, Value of c = %d\n", c );
c /= a;
NSLog(@"Line 5 - /= Operator Example, Value of c = %d\n", c );
c = 200;
c %= a;
NSLog(@"Line 6 - %= Operator Example, Value of c = %d\n", c );
c <<= 2;
NSLog(@"Line 7 - <<= Operator Example, Value of c = %d\n", c );
c >>= 2;
NSLog(@"Line 8 - >>= Operator Example, Value of c = %d\n", c );
c &= 2;
NSLog(@"Line 9 - &= Operator Example, Value of c = %d\n", c );
c ^= 2;
NSLog(@"Line 10 - ^= Operator Example, Value of c = %d\n", c );
c |= 2;
NSLog(@"Line 11 - |= Operator Example, Value of c = %d\n", c );
}
编译并执行上述程序时，会产生以下结果 -
2013-09-07 22:00:19.263 demo[21858] Line 1 - = Operator Example, Value of c = 21
2013-09-07 22:00:19.263 demo[21858] Line 2 - += Operator Example, Value of c = 42
2013-09-07 22:00:19.263 demo[21858] Line 3 - -= Operator Example, Value of c = 21
2013-09-07 22:00:19.263 demo[21858] Line 4 - *= Operator Example, Value of c = 441
2013-09-07 22:00:19.263 demo[21858] Line 5 - /= Operator Example, Value of c = 21
2013-09-07 22:00:19.264 demo[21858] Line 6 - %= Operator Example, Value of c = 11
2013-09-07 22:00:19.264 demo[21858] Line 7 - <<= Operator Example, Value of c = 44
2013-09-07 22:00:19.264 demo[21858] Line 8 - >>= Operator Example, Value of c = 11
2013-09-07 22:00:19.264 demo[21858] Line 9 - &= Operator Example, Value of c = 2
2013-09-07 22:00:19.264 demo[21858] Line 10 - ^= Operator Example, Value of c = 0
2013-09-07 22:00:19.264 demo[21858] Line 11 - |= Operator Example, Value of c = 2
