Borderou de evaluare (job #5715)

Compilare: user.c: In function ‘main’: user.c:10:4: warning: too many arguments for format [-Wformat-extra-args] user.c:7:20: warning: unused variable ‘z1’ [-Wunused-variable] user.c:5:11: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] user.c:6:11: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] user.c:8:9: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] user.c:10:10: warning: ‘f’ is used uninitialized in this function [-Wuninitialized]