C++：统计字符串内大小写字母，数字空格，逗号等

#include<iostream>
using namespace std;
int main()
{
  char c;
  int smallletters = 0, largeletters=0,space = 0, digit = 0,douhao=0, other = 0;
  cout << "请输入字符串：";
  while ((c = getchar()) != '\n')
  {
    if (c >= 'a' && c <= 'z')
    {
      smallletters++;
    }
    else if (c >= 'A' && c <= 'Z')
    {
      largeletters++;
    }
    else if (c == ' ')
    {
      space++;
    }
    else if (c >= '0' && c <= '9')
    {
      digit++;
    }
    else if (c == ',')
    {
      douhao++;
    }
    else
    {
      other++;
    }
  }
  cout <<"小写字母："<< smallletters <<"\t"<<"大写字母："<<largeletters<<"\t"<<"空格："<< space <<"\t"<<"数字："<< digit <<"\t"<<"逗号："<<douhao<<"\t"<<"其它："<< other <<"\t"<< endl;
  return 0;
}