指针左值错误

标签：+=   amp   val   The   potential   assign   左值   his   after   

1
2 int main(void)
3 {
4 int a=1;
5 char *pp;
6 void *p=&a;
7 p++;
8 p+=a;
9 pp=(char *)p;
10 pp+=a;
11 //(char *)p +=a;
12 }

(char *)p +=a; 会报左值错误

The result of (int *) p is a value. This is different from an lvalue. An lvalue (potentially) designates an object. For example, after int x = 3;, the name x designates the object that we defined. We can use it in an expression generally, such as y = 2*x, and then the x is used for its value. But we can also use it in an assignment, such as x = 5, and then the x is used for the object.

指针左值错误

标签：+=   amp   val   The   potential   assign   左值   his   after   

原文地址：https://www.cnblogs.com/idyllcheung/p/13129949.html