C-Interoperability-and-Type-Casting.md

 1. <strong>Avoid mixing C headers, functions, and casting</strong> use corresponding C++ equivalent. Example: use  ```cmath``` not ```math.h```, ```iostream``` not ```stdio.h```
 
     * _Don't_ 
-      ``cpp
+        ```cpp
         #include <stdio.h>
         #include <math.h>
         ...
         float powerOfTwo = powf( 2.f, 5.f );
         printf( "2^5 = %f\n", powerOfTwo );
+        ```
 
     * _Do_
-      ``cpp
+        ```cpp
         #include <iostream>
         #include <cmath>
         ...
         constexpr float powerOfTwo = powf( 2.f, 5.f );
         std::cout << "2^5 = " << powerOfTwo << "\n";              
+        ```
 
 2. <strong>Exception for using C headers/functions:</strong>
     * C++ API is deprecated or not fully supported libraries ( _e.g._ MPI, CUDA_C, PETSc )