View Compilation Error

0_0_28556660_21541.cpp: In function 'int main()':
0_0_28556660_21541.cpp:12:6: error: 'i' was not declared in this scope
  for(i=0;i<3;i++){
      ^
0_0_28556660_21541.cpp:15:18: error: 'i' was not declared in this scope
  printf("%d\n",a[i]);
                  ^