View Compilation Error

0_0_20322278_29677.cpp: In function 'int main()':
0_0_20322278_29677.cpp:8:7: error: 'i' was not declared in this scope
   for(i=0;i<n;i++)
       ^
0_0_20322278_29677.cpp: In function 'void panduan(int, int)':
0_0_20322278_29677.cpp:18:3: error: 't' was not declared in this scope
   t=a;
   ^
0_0_20322278_29677.cpp:23:9: error: return-statement with a value, in function returning 'void' [-fpermissive]
  return a;
         ^
0_0_20322278_29677.cpp:29:13: error: return-statement with a value, in function returning 'void' [-fpermissive]
    { return a;
             ^