View Compilation Error

0_0_21682095_25207.cpp: In function 'int main()':
0_0_21682095_25207.cpp:5:12: error: expected unqualified-id before 'int'
  int cases,int n,a,b,c,sum;
            ^
0_0_21682095_25207.cpp:9:3: error: 'sum' was not declared in this scope
   sum=0;
   ^
0_0_21682095_25207.cpp:10:15: error: 'n' was not declared in this scope
   scanf("%d",&n);
               ^
0_0_21682095_25207.cpp:11:3: error: 'a' was not declared in this scope
   a=floor(n/2.0);
   ^
0_0_21682095_25207.cpp:12:3: error: 'b' was not declared in this scope
   b=floor((n-a)*2.0/3);
   ^
0_0_21682095_25207.cpp:13:3: error: 'c' was not declared in this scope
   c=n-a-b;
   ^