View Compilation Error

0_0_36407891_8326.cpp: In function 'int run(int, int)':
0_0_36407891_8326.cpp:6:8: error: 'n' was not declared in this scope
  while(n)
        ^
0_0_36407891_8326.cpp:9:6: error: 'b' was not declared in this scope
   n/=b;
      ^