View Compilation Error

0_0_31075809_19183.cpp: In function 'int main()':
0_0_31075809_19183.cpp:4:2: error: 'doublea' was not declared in this scope
  doublea r;
  ^
0_0_31075809_19183.cpp:5:13: error: 'r' was not declared in this scope
  while(cin>>r){
             ^