What are the important notions in C that you did not learn from your teachers? [closed]

Answer 1

Use of const keyword in pointers context:

The difference between following declarations:

 A)   const char* pChar  // pointer to a CONSTANT char
 B)   char* const pChar  // CONSTANT pointer to a char
 C)   const char* const pChar  // Both

So with A:

const char* pChar = 'M';
*pChar = 'S'; // error: you can't modify value pointed by pChar

And with B:

char OneChar = 'M';
char AnotherChar = 'S';
char* const pChar = &OneChar;
pChar = &AnotherChar; // error: you can't modify address of pChar