Eroare de compilare: user.cpp: In function ‘void back(int)’: user.cpp:23: warning: comparisons like ‘X<=Y<=Z’ do not have their mathematical meaning user.cpp:39: warning: comparisons like ‘X<=Y<=Z’ do not have their mathematical meaning user.cpp:56: warning: comparisons like ‘X<=Y<=Z’ do not have their mathematical meaning user.cpp:72: warning: comparisons like ‘X<=Y<=Z’ do not have their mathematical meaning user.cpp:97: error: ‘exit’ was not declared in this scope user.cpp: In function ‘int main()’: user.cpp:104: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:106: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result