Borderou de evaluare (job #547157)

Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:10:7: error: ‘n’ was not declared in this scope user.cpp:12:8: error: ‘a’ was not declared in this scope user.cpp:13:5: error: lvalue required as increment operand user.cpp:14:2: error: expected ‘;’ before ‘}’ token user.cpp:17:8: error: ‘b’ was not declared in this scope user.cpp:18:5: error: lvalue required as increment operand user.cpp:19:2: error: expected ‘;’ before ‘}’ token user.cpp:23:2: error: expected ‘;’ before ‘return’