# V2677\. MISRA\. String literals with different encoding prefixes should not be concatenated\.

This diagnostic rule is based on the [MISRA](https://misra.org.uk/) \(Motor Industry Software Reliability Association\) software development guidelines\.

This diagnostic rule is relevant only for C\+\+\.

The analyzer has detected a code fragment where string literals with different encoding prefixes are automatically concatenated\.

Using different prefixes when concatenating string literals causes a data type conflict between the string elements \(for example, `char` and `wchar_t`\)\. The compiler cannot correctly determine the final type and size of the resulting literal\. Depending on the build settings, this results in either a compilation error or undefined behavior due to incorrect type conversion, which completely distorts the byte representation of characters in memory\.

The example:

```cpp
const wchar_t *banner = "Hello," L" world";
```

When string literals without a prefix are concatenated with string literals prefixed with `L`, the data types conflict, preventing the compiler from safely constructing a single literal\.

The fixed code:

```cpp
const wchar_t *banner = L"Hello," L" world";
```