Borderou de evaluare (job #406291)

Eroare de compilare: user.c:1:0: warning: ignoring #pragma warning [-Wunknown-pragmas] user.c: In function ‘combinations’: user.c:43:3: error: ‘for’ loop initial declarations are only allowed in C99 mode user.c:43:3: note: use option -std=c99 or -std=gnu99 to compile your code user.c:48:4: error: ‘for’ loop initial declarations are only allowed in C99 mode user.c: In function ‘write_books_combinations_to_file’: user.c:89:7: warning: unused variable ‘buffer’ [-Wunused-variable] user.c: In function ‘read_books_from_file’: user.c:77:7: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result]