View Compilation Error

0_0_37145381_32656.cpp:4:2: error: expected primary-expression before 'int'
  int a,b,i,sum;
  ^
0_0_37145381_32656.cpp:4:2: error: expected '}' before 'int'
0_0_37145381_32656.cpp:4:2: error: expected ',' or ';' before 'int'
0_0_37145381_32656.cpp:5:7: error: expected constructor, destructor, or type conversion before '(' token
  scanf("%d",&a);
       ^
0_0_37145381_32656.cpp:6:2: error: expected unqualified-id before 'while'
  while(a--)
  ^