Compilare: user.c: In function ‘main’: user.c:6:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("editor.in","r",stdin),freopen("editor.out","w",stdout),scanf("%d\n",&t); ^ user.c:6:43: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("editor.in","r",stdin),freopen("editor.out","w",stdout),scanf("%d\n",&t); ^ user.c:6:74: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("editor.in","r",stdin),freopen("editor.out","w",stdout),scanf("%d\n",&t); ^ user.c:8:13: warning: ignoring return value of ‘gets’, declared with attribute warn_unused_result [-Wunused-result] gets(v),n=strlen(v),ri=rd=pi=pd=0,memset(e,0,sizeof(e)); ^ /tmp/ccG912UA.o: In function `main': user.c:(.text.startup+0x8b): warning: the `gets' function is dangerous and should not be used.