View Compilation Error

0_0_29445891_20544.cpp:3:1: error: expected primary-expression before 'double'
 double a;
 ^
0_0_29445891_20544.cpp:3:1: error: expected '}' before 'double'
0_0_29445891_20544.cpp:3:1: error: expected ',' or ';' before 'double'
0_0_29445891_20544.cpp:4:1: error: expected unqualified-id before 'while'
 while(scanf("%lf",&a)!=EOF)
 ^
0_0_29445891_20544.cpp:6:1: error: expected unqualified-id before 'return'
 return 0;}
 ^
0_0_29445891_20544.cpp:6:10: error: expected declaration before '}' token
 return 0;}
          ^