View Compilation Error

0_0_36252655_24284.cpp: In function 'int main()':
0_0_36252655_24284.cpp:4:7: error: expected initializer before 'i'
 int n i,sum=0;
       ^
0_0_36252655_24284.cpp:5:19: error: 'n' was not declared in this scope
 while(scanf("%d",&n)!=-1)
                   ^
0_0_36252655_24284.cpp:7:1: error: 'sum' was not declared in this scope
 sum=0;
 ^
0_0_36252655_24284.cpp:8:5: error: 'i' was not declared in this scope
 for(i=0;i<=n;i++)
     ^