View Compilation Error

0_0_21596830_3849.cpp:12:42: error: stray '#' in program
 for(int i=0;i<len;i++)bck=bck*10+tmp[i]-'0';
                                          ^
0_0_21596830_3849.cpp:12:48: error: stray '#' in program
 for(int i=0;i<len;i++)bck=bck*10+tmp[i]-'0';
                                                ^
0_0_21596830_3849.cpp: In function 'int read()':
0_0_21596830_3849.cpp:12:43: error: lvalue required as unary '&' operand
 for(int i=0;i<len;i++)bck=bck*10+tmp[i]-'0';
                                           ^