# V589\. Expression of the 'A \=\- B' kind is used\. Possibly meant: 'A \-\= B'\. Consider inspecting the expression\.

The analyzer detected a potential error: there is a sequence of '\=\-' characters in code\. It might be a misprint and you should use the '\-\=' operator\.

Consider this sample:

```cpp
size_t size, delta;
...
size =- delta;
```

This code may be correct, but it is highly probable that there is a misprint and the programmer actually intended to use the '\-\=' operator\. This is the fixed code:

```cpp
size_t size, delta;
...
size -= delta;
```

If the code is correct, you may type in an additional space between the characters '\=' and '\-' to remove the V589 warning\. This is an example of correct code where the warning is not generated:

```cpp
size = -delta;
```



To make false reports fewer, there are some specific exceptions to the V589 rule\. For instance, the analyzer will not generate the warning if a programmer does not use spaces between variables and operators\. Here you are some samples of code the analyzer considers safe:

```cpp
A=-B;
int Z =- 1;
N =- N;
```



Note\. To search for misprints of the 'A \=\+ B' type, the V588 diagnostic check is used\.