View Compilation Error

0_0_33812862_29679.cpp:43:6: error: expected initializer before 'int'
      int ans=0;
      ^
0_0_33812862_29679.cpp:44:25: error: 'n' was not declared in this scope
      int len=calchangdu(n);
                         ^
0_0_33812862_29679.cpp:45:14: error: expected constructor, destructor, or type conversion before '(' token
      caldigit(n,len);
              ^
0_0_33812862_29679.cpp:46:6: error: expected unqualified-id before 'for'
      for(int i=len;i>=1;i--)
      ^
0_0_33812862_29679.cpp:46:20: error: 'i' does not name a type
      for(int i=len;i>=1;i--)
                    ^
0_0_33812862_29679.cpp:46:25: error: 'i' does not name a type
      for(int i=len;i>=1;i--)
                         ^
0_0_33812862_29679.cpp:58:6: error: expected unqualified-id before 'return'
      return ans;
      ^
0_0_33812862_29679.cpp:59:1: error: expected declaration before '}' token
 }
 ^