Compilare: user.cpp: In function ‘int main()’: user.cpp:13:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(c);++i) ^ user.cpp:12:22: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(c,1028,fin); ^