Compilare: user.c: In function ‘main’: user.c:6:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.in","r",stdin),freopen("strmatch.out","w",stdout),gets(s),gets(u),m=strlen(s),n=strlen(u); ^ user.c:6:42: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.in","r",stdin),freopen("strmatch.out","w",stdout),gets(s),gets(u),m=strlen(s),n=strlen(u); ^ user.c:6:74: warning: ignoring return value of ‘gets’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.in","r",stdin),freopen("strmatch.out","w",stdout),gets(s),gets(u),m=strlen(s),n=strlen(u); ^ user.c:6:82: warning: ignoring return value of ‘gets’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.in","r",stdin),freopen("strmatch.out","w",stdout),gets(s),gets(u),m=strlen(s),n=strlen(u); ^ /tmp/ccGrjniF.o: In function `main': user.c:(.text.startup+0x5b): warning: the `gets' function is dangerous and should not be used.