Eroare de compilare: user.cpp:2:21: error: iostream.h: No such file or directory user.cpp: In function ‘int main()’: user.cpp:38: warning: format ‘%s’ expects type ‘char*’, but argument 3 has type ‘char (*)[100001]’ user.cpp:40: error: ‘strlen’ was not declared in this scope user.cpp:44: error: ‘isdigit’ was not declared in this scope user.cpp:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result