===

File* fp = fopen("lalala.txt", "r");

if (fp == NULL){
   //...error handling
}
else{
	
}

===

FILE* myfopen(char* filename, char* mode, int* return_code){
      
}

===

#include <stdio.h>
int main ()
{
  FILE * pFile;
  pFile=fopen("myfile.txt","r");
  if (pFile==NULL) perror ("Error opening file");
  else {
    fputc ('x',pFile);
    if (ferror (pFile))
      printf ("Error Writing to myfile.txt\n");
    fclose (pFile);
  }
  return 0;
}

===

* try ... catch ...
* forced: none-Error, none-RunTimeException
* method declaration "throws ...."
* throw statement: throw new BlahblahException();
* go through stack traversal until someone handles it

===

QUESTION: why finally? what's the difference of finally when exception didn't happen?