条条大路通罗马，为何不尝试一下别的函数或方法？


*-http://www.pinggu.org/bbs/thread-992988-1-1.html

  clear
  input double city int ind
  1101010303            4
  110101002102          2
  353656647             7
  end
  
  *format city %20.0f
  gen city_str1 = string(city, "%20.0g")
  *tostring city, gen(city_str1)
  gen city_str2 = reverse(city_str1)
  gen city_3 = real(substr(city_str2,1,1))
  
  gen match = (city_3==ind)
  list, noobs clean

city	ind	city_str1	city_str2	city_3	match
1.101e+09	4	1101010303	3030101011	3	0
1.101e+11	2	110101002102	201200101011	2	1
3.537e+08	7	353656647	746656353	7	1