Eroare de compilare: user.c: In function ‘process’: user.c:17: error: ‘for’ loop initial declarations are only allowed in C99 mode user.c:17: note: use option -std=c99 or -std=gnu99 to compile your code user.c:18: error: ‘for’ loop initial declarations are only allowed in C99 mode user.c: In function ‘main’: user.c:33: error: ‘for’ loop initial declarations are only allowed in C99 mode user.c:30: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:31: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:32: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:34: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result