View Compilation Error

0_0_18602008_28361.cpp: In function 'int main()':
0_0_18602008_28361.cpp:8:10: error: expected primary-expression before ')' token
  while(t-)
          ^
0_0_18602008_28361.cpp:13:3: error: 'mark' was not declared in this scope
   mark=0;
   ^