Compilare: user.cpp: In function ‘int transf(char*)’: user.cpp:15:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<strlen(p) && strchr(cifre, p[i])!=NULL) ^ user.cpp: In function ‘int main()’: user.cpp:43:24: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s, 1300, fin); ^