View Compilation Error

0_0_37713586_18133.cpp: In function 'int main()':
0_0_37713586_18133.cpp:21:11: error: 'v' was not declared in this scope
           v=n;
           ^
0_0_37713586_18133.cpp:22:14: error: 'v' was not declared in this scope
         else v=40;
              ^
0_0_37713586_18133.cpp:23:24: error: 'v' was not declared in this scope
         for(int i=1;i<=v;i++)
                        ^