View Compilation Error

0_0_28993357_26685.cpp: In function 'int main()':
0_0_28993357_26685.cpp:46:4: error: 'v' was not declared in this scope
    v++;  
    ^
0_0_28993357_26685.cpp:49:9: error: 'v' was not declared in this scope
   cout<<v-1<<endl;}
         ^