What does *& mean in c++
Both the & and &** operators in C are used to get addresses, but their subtle difference is that the & operator gets the address of a variable, which is stored in a pointer variable, and the pointer type points to the variable type. The &** operator gets the address of the pointer variable, stored in the pointer variable, and the pointer type points to the pointer type. Purpose: The & operator is used to get the address of a variable to be passed to a function or stored in another variable, while the &** operator is used to get the address of a pointer variable and is used to create a pointer to a pointer.
The & and &** operators in C
In C, The & and & operators are used to get the address of a variable, but they have a subtle difference:
& Operator:
- ## The & operator takes the address of a variable and stores that address in another variable.
- The operator is followed by a variable name.
- The generated address type is a pointer type, pointing to the variable type being addressed.
Example:
int num = 10; int *ptr = # // ptr 现在指向 num 的地址，类型为 int*
& Operator: **
- & The operator takes the address of a pointer and generates a pointer to the pointer variable. The operator is followed by a pointer variable name.
- The generated address type is a pointer type pointing to a pointer type.
Example:
int num = 10; int *ptr = # int **ptrptr = &ptr; // ptrptr 现在指向 ptr 的地址，类型为 int**
Difference:
- & operator takes the address of the variable, while
- & The operator takes the address of the pointer. The & operator produces a pointer type that points to a variable type, while the
- & operator produces a pointer type that points to a pointer type.
Purpose: The
- & operator is used to get the address of a variable so that it can be passed to a function or stored in another variable.
- & operator is used to get the address of a pointer variable and is used to create a pointer to a pointer.
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