View Compilation Error

0_0_27015225_18569.cpp: In function 'int main()':
0_0_27015225_18569.cpp:5:3: error: 'duoble' was not declared in this scope
  {duoble a,b,c;
   ^
0_0_27015225_18569.cpp:6:21: error: 'a' was not declared in this scope
  scanf("%lf%lf%lf",&a,&b,&c);
                     ^
0_0_27015225_18569.cpp:6:24: error: 'b' was not declared in this scope
  scanf("%lf%lf%lf",&a,&b,&c);
                        ^
0_0_27015225_18569.cpp:6:27: error: 'c' was not declared in this scope
  scanf("%lf%lf%lf",&a,&b,&c);
                           ^