Compilare: user.c: In function ‘main’: user.c:8:5: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] (void)fscanf(f,"%d",&n); ^~~~~~~~~~~~~~~~~~~~~~~ user.c:9:5: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] (void)freopen("bigfour.out","wt",stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ user.c:12:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] (void)fscanf(f,"%d%d%d%d%d",&x,&a,&b,&c,&d); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~