View Compilation Error

0_0_27898594_27998.cpp: In function 'int main()':
0_0_27898594_27998.cpp:6:5: error: 'doubel' was not declared in this scope
     doubel a;
     ^
0_0_27898594_27998.cpp:7:8: error: 'a' was not declared in this scope
     if(a>=0)
        ^