Compilare: user.c: In function ‘main’: user.c:75:24: warning: unused variable ‘r’ [-Wunused-variable] int i,q,op,x,nrc=0,r; ^ user.c:75:18: warning: unused variable ‘nrc’ [-Wunused-variable] int i,q,op,x,nrc=0,r; ^ user.c:76:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("hashuri.in","r",stdin); ^ user.c:77:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("hashuri.out","w",stdout); ^ user.c:78:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&q); ^ user.c:82:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&op,&x); ^