View Compilation Error

0_0_23043393_28193.cpp: In function 'int main()':
0_0_23043393_28193.cpp:12:22: error: 'tot' was not declared in this scope
             num[i] = tot ++;
                      ^
0_0_23043393_28193.cpp:14:47: error: 'tot' was not declared in this scope
         for(int i = 2;i <= n;i += 2) num[i] = tot ++;
                                               ^