View Compilation Error

0_0_25188946_300.cpp: In function 'int main()':
0_0_25188946_300.cpp:63:9: error: 'tot1' was not declared in this scope
   cout<<tot1-tot2/2<<endl;
         ^
0_0_25188946_300.cpp:63:14: error: 'tot2' was not declared in this scope
   cout<<tot1-tot2/2<<endl;
              ^