View Compilation Error

0_0_29746209_22012.cpp: In function 'int main()':
0_0_29746209_22012.cpp:19:3: error: 'itn' was not declared in this scope
   itn v=-1;
   ^
0_0_29746209_22012.cpp:22:7: error: 'v' was not declared in this scope
    if(v==-1||a[v]<a[i])
       ^
0_0_29746209_22012.cpp:25:23: error: 'v' was not declared in this scope
   printf("%.2lf\n", a[v]);
                       ^