View Compilation Error

0_0_35705910_12530.cpp: In function 'int main()':
0_0_35705910_12530.cpp:17:47: error: 'i' was not declared in this scope
    for(int j = 1; j <= 5; j++) scanf("%d",&st[i]);
                                               ^
0_0_35705910_12530.cpp:21:15: error: 'i' was not declared in this scope
     sum += st[i];
               ^