C ++运算符优先级=，*和++ [英] C++ Operator priority =, * and ++

问题描述

我对这个指针值分配有疑问:

I have a question with this pointer value assignment:

*p++ = *q++;

根据 运营商优先级表

运算符的优先级为"++">"*">"=".

The priorities of operators are "++" > "*" > "=".

但是上述语句的结果首先执行赋值"="，如下所示

But the result of the above statement does the assignment "=" first, as the following

*p = *q;
p++;
q++; 

为什么?

推荐答案

后递增运算符在其值已经计算之后，将其操作数递增.因此，指针的引用发生在指针的值上在这条线之前举行.但是，您给出的优先级是正确的.该表达式确实等同于

The post-increment operator increments its operand after its value has already been computed. The pointer dereference therefore occurs on the values the pointers held before this line. However, the precedence you give is correct; the expression is indeed equivalent to

(*(p++)) = (*(q++))

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