The difference between & and * in c++

The difference between & and * in C is: & takes the variable address and stores the address in the pointer variable. Dereference a pointer variable to obtain the value it points to.

The difference between & and * in C

Short answer:

& takes the variable address, while * dereferences the address.

Detailed explanation:

Get address (&):

• & Operation operator is used to obtain the memory address of a variable.
• Store the address in another variable, which is called a pointer variable.
• The data type of the pointer variable must be the same as the data type of the variable pointed to.

For example:

int num = 10;
int *ptr = #

In the above code, ptr now points to the memory address of num.

Dereference address (*):

• * The operator is used to dereference a pointer variable and obtain the value it points to.
• It is equivalent to accessing the pointed variable.
• You can use the * operator to read and write pointer variables.

For example:

int num = 10;
int *ptr = #
*ptr = 20;

In the above code, *ptr dereferences ptr and changes The value pointed to, that is, the value of num becomes 20.

Summary of differences:

& and * operators are usually used in pairs. Use & to get the address, then use * to dereference the address to access or modify the value.

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