Eroare de compilare: user.c: In function ‘main’: user.c:20: error: ‘for’ loop initial declarations are only allowed in C99 mode user.c:20: note: use option -std=c99 or -std=gnu99 to compile your code user.c:21: error: ‘for’ loop initial declarations are only allowed in C99 mode user.c:27: error: redeclaration of ‘i’ with no linkage user.c:20: note: previous definition of ‘i’ was here user.c:11: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:28: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:32: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result