View Compilation Error

0_0_38421697_18194.cpp: In function 'int main()':
0_0_38421697_18194.cpp:19:3: error: 'tot' was not declared in this scope
   tot = 0; memset(head, 0, sizeof(head));
   ^
0_0_38421697_18194.cpp:19:19: error: 'head' was not declared in this scope
   tot = 0; memset(head, 0, sizeof(head));
                   ^