# V541\. String is printed into itself\. Consider inspecting the expression\.

The analyzer detected a potential error: a string gets printed inside itself\. This may lead to unexpected results\.

Look at this sample:

```cpp
char s[100] = "test";
sprintf(s, "N = %d, S = %s", 123, s);
```

In this code, the 's' buffer is used simultaneously as a buffer for a new string and as one of the elements making up the text\. The programmer intends to get this string:

N \= 123, S \= test

But actually this code will cause creating the following string:

N \= 123, S \= N \= 123, S \=

In other cases, such code can lead not only to the output of incorrect text, but also to the buffer overflow or a program crash\. To fix the code, we should use a new buffer to save the result\. This is the correct code:

```cpp
char s1[100] = "test";
char s2[100];
sprintf(s2, "N = %d, S = %s", 123, s1);
```