Update

c_pitfalls.md

@@ -54,7 +54,9 @@ C is **not** a subset of C++, i.e. not every C program is a C++ program (for sim
 
 For portability sake it is good to try to write C code that will also compile as C++ (and behave the same). For this we should know some basic differences in behavior between C and C++.
 
-One difference lies for example in [pointers](pointer.md) to string literals. While in C it is possible to have non-const pointers such as
+One difference is e.g. in that type of character literals is int in C but char in C++, so `sizeof('x')` will likely yield different values.
+
+Another difference lies for example in [pointers](pointer.md) to string literals. While in C it is possible to have non-const pointers such as
 
 ```
 char *s = "abc";
@@ -66,7 +68,18 @@ C++ requires any such pointer to be `const`, i.e.:
 const char *s = "abc";
 ```
 
-TODO: more examples
+C++ generally has stronger typing, e.g. C allows assigning a pointer to void to any other pointer while C++ requires explicit type cast, typically seen with malloc:
+
+```
+int *array1 = malloc(N * sizeof(int));         // valid only in C
+int *array2 = (int *) malloc(N * sizeof(int)); // valid in both C and C++
+```
+
+C allows skipping initialization (variable declarations) e.g. gotos or switches, C++ prohibits it.
+
+And so on.
+
+{ A quite detailed list is at https://en.wikipedia.org/wiki/Compatibility_of_C_and_C%2B%2B. ~drummyfish }
 
 ## Compiler Optimizations