Eroare de compilare: user.cpp: In function ‘void citire()’: user.cpp:33: error: ‘isdigit’ was not declared in this scope user.cpp:34: error: ‘isdigit’ was not declared in this scope user.cpp:35: error: ‘isdigit’ was not declared in this scope user.cpp:36: error: ‘isdigit’ was not declared in this scope user.cpp:37: error: ‘isdigit’ was not declared in this scope user.cpp:38: error: ‘isdigit’ was not declared in this scope user.cpp:39: error: ‘isdigit’ was not declared in this scope user.cpp:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:32: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result