Borderou de evaluare (job #43447)

Compilare: user.c: In function ‘main’: user.c:9:20: warning: unused variable ‘x’ [-Wunused-variable] user.c:9:16: warning: unused variable ‘a’ [-Wunused-variable] user.c:7:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] user.c:8:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] user.c:10:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]