Eroare de compilare: user.cpp:2:15: error: io.h: No such file or directory user.cpp:8: error: ‘::main’ must return ‘int’ user.cpp: In function ‘int main()’: user.cpp:22: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp:11: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:12: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:20: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result