View Compilation Error

0_0_13958631_24705.cpp: In function 'int main()':
0_0_13958631_24705.cpp:4:1: error: declaration does not declare anything [-fpermissive]
 int ;
 ^
0_0_13958631_24705.cpp:5:19: error: 'n' was not declared in this scope
 while(scanf("%d",&n)!=EOF)
                   ^
0_0_13958631_24705.cpp:6:2: error: 'sum' was not declared in this scope
 {sum=0;
  ^
0_0_13958631_24705.cpp:7:5: error: 'i' was not declared in this scope
 for(i=0;i<=n;i++)
     ^
0_0_13958631_24705.cpp:10:15: error: 'sum' was not declared in this scope
 printf("%d\n",sum);
               ^