Eroare de compilare: user.c: In function ‘main’: user.c:22: error: ‘for’ loop initial declarations are only allowed in C99 mode user.c:22: note: use option -std=c99 or -std=gnu99 to compile your code user.c:45: error: redefinition of ‘i’ user.c:22: note: previous definition of ‘i’ was here user.c:45: error: ‘for’ loop initial declarations are only allowed in C99 mode user.c:68: error: redefinition of ‘i’ user.c:45: note: previous definition of ‘i’ was here user.c:68: error: ‘for’ loop initial declarations are only allowed in C99 mode user.c:19: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:20: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:25: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result