指针类型啊! To see how pointers work, look at the following example.1 var2 X, Y: Integer; // X and Y are Integer variables 3 P: ^Integer; // P points to an Integer 4 begin 5 X := 17; // assign a value to X 6 P := @X; // assign the address of X to P 7 Y := P^; // dereference P; assign the result to Y 8 end;Line 2 declares X and Y as variables of type Integer. Line 3 declares P as a pointer to an Integer value; this means that P can point to the location of X or Y. Line 5 assigns a value to X, and line 6 assigns the address of X (denoted by @X) to P. Finally, line 7 retrieves the value at the location pointed to by P (denoted by ^P) and assigns it to Y. After this code executes, X and Y have the same value, namely 17.^typeName梚t denotes a type that represents pointers to variables of type typeName. When it appears after a pointer variable?pointer^梚t dereferences the pointer; that is, it returns the value stored at the memory address held by the pointer.
To see how pointers work, look at the following example.1 var2 X, Y: Integer; // X and Y are Integer variables
3 P: ^Integer; // P points to an Integer
4 begin
5 X := 17; // assign a value to X
6 P := @X; // assign the address of X to P
7 Y := P^; // dereference P; assign the result to Y
8 end;Line 2 declares X and Y as variables of type Integer. Line 3 declares P as a pointer to an Integer value; this means that P can point to the location of X or Y. Line 5 assigns a value to X, and line 6 assigns the address of X (denoted by @X) to P. Finally, line 7 retrieves the value at the location pointed to by P (denoted by ^P) and assigns it to Y. After this code executes, X and Y have the same value, namely 17.^typeName梚t denotes a type that represents pointers to variables of type typeName. When it appears after a pointer variable?pointer^梚t dereferences the pointer; that is, it returns the value stored at the memory address held by the pointer.