View Compilation Error

0_0_35696461_29488.cpp:16:2: error: missing terminating " character
  while (scanf(%d%c%c",&all_len,&ch1,&ch2)!=EOF)
  ^
0_0_35696461_29488.cpp: In function 'int main()':
0_0_35696461_29488.cpp:16:15: error: expected primary-expression before '%' token
  while (scanf(%d%c%c",&all_len,&ch1,&ch2)!=EOF)
               ^
0_0_35696461_29488.cpp:16:16: error: 'd' was not declared in this scope
  while (scanf(%d%c%c",&all_len,&ch1,&ch2)!=EOF)
                ^
0_0_35696461_29488.cpp:16:18: error: 'c' was not declared in this scope
  while (scanf(%d%c%c",&all_len,&ch1,&ch2)!=EOF)
                  ^
0_0_35696461_29488.cpp:68:10: error: expected ')' before ';' token
  return 0;
          ^