View Compilation Error

0_0_39423552_31552.cpp: In function 'int maxprime(int)':
0_0_39423552_31552.cpp:13:25: error: 'res' was not declared in this scope
   13 |                         res=i;
      |                         ^~~
0_0_39423552_31552.cpp: In function 'int main()':
0_0_39423552_31552.cpp:34:25: error: 't' was not declared in this scope
   34 |                         t=a;
      |                         ^
0_0_39423552_31552.cpp:38:18: error: 't' was not declared in this scope
   38 |         count << t;
      |                  ^