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Update const-cpp.md #4457

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11 changes: 8 additions & 3 deletions docs/cpp/const-cpp.md
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Expand Up @@ -147,7 +147,7 @@ int main()

## C and C++ `const` differences

When you declare a variable as **`const`** in a C source code file, you do so as:
When you define a **`const`** variable in a C source code file, you do so as:

```C
const int i = 2;
Expand All @@ -159,13 +159,18 @@ You can then use this variable in another module as follows:
extern const int i;
```

But to get the same behavior in C++, you must declare your **`const`** variable as:
But to get the same behavior in C++, you must define your **`const`** variable as:

```cpp
extern const int i = 2;
```
Similar to C, you can then use this variable in another module as follows:

If you wish to declare an **`extern`** variable in a C++ source code file for use in a C source code file, use:
```cpp
extern const int i;
```

If you wish to define an **`extern`** variable in a C++ source code file for use in a C source code file, use:

```cpp
extern "C" const int x=10;
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