View Compilation Error

0_0_18673111_23594.cpp: In function 'int main()':
0_0_18673111_23594.cpp:3:11: error: expected initializer before 'sum'
 {int n, i sum;
           ^
0_0_18673111_23594.cpp:4:5: error: 'i' was not declared in this scope
 for(i=0;i<=n;i++)
     ^
0_0_18673111_23594.cpp:5:1: error: 'sum' was not declared in this scope
 sum+=i;
 ^
0_0_18673111_23594.cpp:6:17: error: 'sum' was not declared in this scope
 printf("%d\n\n",sum);
                 ^