View Compilation Error

0_0_26539927_10800.cpp:18:3: error: missing terminating " character
   printf("%d\n,level);
   ^
0_0_26539927_10800.cpp: In function 'int main()':
0_0_26539927_10800.cpp:6:22: error: lvalue required as left operand of assignment
  while(scanf("%s",ch)=1)
                      ^
0_0_26539927_10800.cpp:19:2: error: expected primary-expression before '}' token
  }
  ^