View Compilation Error

0_0_18504706_26528.cpp: In function 'int main()':
0_0_18504706_26528.cpp:5:6: error: redeclaration of 'int i'
  int i=1;int sum=0;
      ^
0_0_18504706_26528.cpp:4:6: note: 'int i' previously declared here
  int i,n,sum;
      ^
0_0_18504706_26528.cpp:5:14: error: redeclaration of 'int sum'
  int i=1;int sum=0;
              ^
0_0_18504706_26528.cpp:4:10: note: 'int sum' previously declared here
  int i,n,sum;
          ^