Compilare: user.cpp: In function ‘void semn(char*)’: user.cpp:37:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<strlen(s)) ^ user.cpp: In function ‘int main()’: user.cpp:20:5: warning: ‘n’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(int i = 1; i <= n; ++i) ^