Compilare: user.cpp: In function ‘int sumcif(char*)’: user.cpp:10:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(a);i++) ^ user.cpp: In function ‘int main()’: user.cpp:18:5: warning: ‘n’ is used uninitialized in this function [-Wuninitialized] for(int i=1;i<=n;i++) ^