賦值運算符

還有C語言支持以下賦值運算符：

運算符	描述	示例
=	簡單的賦值操作符，分配值從右邊的操作數到左側的操作數	C = A + B 將分配值 A + B 到 C
+=	ADD與賦值運算符，它增加右操作數左操作數並分配結果左操作數	C += A 相當於 C = C + A
-=	減法與賦值運算符，它從左側的操作數減去右操作數和分配結果到左操作數	C -= A 相當於 C = C - A
*=	乘法與賦值運算符，它乘以右邊的操作數與左操作數和分配結果左操作數	C *= A 相當於 C = C * A
/=	除法與賦值運算符，它把左操作數與右操作數和分配結果左操作數	C /= A 相當於 C = C / A
%=	模量和賦值運算符，它需要使用兩個操作數的模量和分配結果左操作數	C %= A 相當於 C = C % A
<<=	左移位並賦值運算符	C <<= 2 和 C = C << 2 一樣
>>=	向右移位並賦值運算符	C >>= 2 和 C = C >> 2 一樣
&=	按位與賦值運算符	C &= 2 和 C = C & 2 一樣
^=	按位異或並賦值運算符	C ^= 2 和 C = C ^ 2 一樣
|=	按位或並賦值運算符	C |= 2 和 C = C | 2 一樣

例子

試試下麵的例子就明白了可用C語言編程的所有賦值運算符：

#include <stdio.h>

main()
{
   int a = 21;
   int c ;

   c =  a;
   printf("Line 1 - =  Operator Example, Value of c = %d
", c );

   c +=  a;
   printf("Line 2 - += Operator Example, Value of c = %d
", c );

   c -=  a;
   printf("Line 3 - -= Operator Example, Value of c = %d
", c );

   c *=  a;
   printf("Line 4 - *= Operator Example, Value of c = %d
", c );

   c /=  a;
   printf("Line 5 - /= Operator Example, Value of c = %d
", c );

   c  = 200;
   c %=  a;
   printf("Line 6 - %= Operator Example, Value of c = %d
", c );

   c <<=  2;
   printf("Line 7 - <<= Operator Example, Value of c = %d
", c );

   c >>=  2;
   printf("Line 8 - >>= Operator Example, Value of c = %d
", c );

   c &=  2;
   printf("Line 9 - &= Operator Example, Value of c = %d
", c );

   c ^=  2;
   printf("Line 10 - ^= Operator Example, Value of c = %d
", c );

   c |=  2;
   printf("Line 11 - |= Operator Example, Value of c = %d
", c );

}

當編譯和執行上麵的程序就產生以下結果：

Line 1 - =  Operator Example, Value of c = 21
Line 2 - += Operator Example, Value of c = 42
Line 3 - -= Operator Example, Value of c = 21
Line 4 - *= Operator Example, Value of c = 441
Line 5 - /= Operator Example, Value of c = 21
Line 6 - %= Operator Example, Value of c = 11
Line 7 - <<= Operator Example, Value of c = 44
Line 8 - >>= Operator Example, Value of c = 11
Line 9 - &= Operator Example, Value of c = 2
Line 10 - ^= Operator Example, Value of c = 0
Line 11 - |= Operator Example, Value of c = 2