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2023-12-01

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