Compilare: user.cpp: In function ‘int main()’: user.cpp:19: warning: format ‘%s’ expects type ‘char*’, but argument 3 has type ‘std::string*’ user.cpp:56: warning: cannot pass objects of non-POD type ‘struct std::string’ through ‘...’; call will abort at runtime user.cpp:56: warning: format ‘%s’ expects type ‘char*’, but argument 3 has type ‘int’ user.cpp:9: warning: unused variable ‘jmax’ user.cpp:9: warning: unused variable ‘n’ user.cpp:13: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:14: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:19: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result