Borderou de evaluare (job #500559)

Eroare de compilare: user.cpp: In function 'int main()': user.cpp:6:11: error: expected initializer before '>>' token user.cpp:9:8: error: 'a1' was not declared in this scope user.cpp:9:12: error: 'b1' was not declared in this scope user.cpp:9:16: error: 'a2' was not declared in this scope user.cpp:9:20: error: 'b2' was not declared in this scope user.cpp:10:9: error: 'r1' was not declared in this scope user.cpp:11:9: error: 'r2' was not declared in this scope user.cpp:16:9: error: 'r1' was not declared in this scope user.cpp:17:9: error: 'r2' was not declared in this scope user.cpp:20:8: error: 'a1' was not declared in this scope user.cpp:20:16: error: 'b1' was not declared in this scope user.cpp:20:20: error: 'a2' was not declared in this scope