View Compilation Error

0_0_17159862_1885.cpp: In function 'int main()':
0_0_17159862_1885.cpp:5:2: error: 'duoble' was not declared in this scope
 {duoble a,b;
  ^
0_0_17159862_1885.cpp:6:20: error: 'a' was not declared in this scope
 while(scanf("%lf",&a)!=EOF);
                    ^
0_0_17159862_1885.cpp:8:1: error: 'b' was not declared in this scope
 b=fabs(a);
 ^
0_0_17159862_1885.cpp:8:8: error: 'a' was not declared in this scope
 b=fabs(a);
        ^