Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:34: error: ‘strlen’ was not declared in this scope user.cpp:21: warning: unused variable ‘j’ user.cpp:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:31: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result user.cpp:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result