Compilare: user.cpp: In function ‘int similitudine(char*, char*)’: user.cpp:36:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<strlen(c1);i++) ^ user.cpp:37:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<strlen(c2);j++) ^ user.cpp: In function ‘int main()’: user.cpp:106:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i<strlen(s)) ^ user.cpp:117:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (s[i]<'a' || s[i]>'z' || i==strlen(s)-1) ^ user.cpp:130:27: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] cuv[i]=NULL; ^