View Compilation Error

0_0_38245943_19513.cpp: In function 'int main()':
0_0_38245943_19513.cpp:5:22: error: 'a' was not declared in this scope
   scanf("%lf%lf%lf",&a,&b,&c);
                      ^
0_0_38245943_19513.cpp:5:25: error: 'b' was not declared in this scope
   scanf("%lf%lf%lf",&a,&b,&c);
                         ^
0_0_38245943_19513.cpp:5:28: error: 'c' was not declared in this scope
   scanf("%lf%lf%lf",&a,&b,&c);
                            ^
0_0_38245943_19513.cpp: At global scope:
0_0_38245943_19513.cpp:11:2: error: expected unqualified-id before 'return'
  return 0;
  ^
0_0_38245943_19513.cpp:12:1: error: expected declaration before '}' token
 }
 ^