C++：统计字符串内大小写字母，数字空格，逗号等

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原题：
用赋初值的方法把字符串 “ C is a general purpose, procedural, imperative computer programming language developed in 1972 by Dennis Ritchie at the Bell Telephone Laboratories for use with the Unix operating system.” 存放到字符数组s中，编程统计其中的大写字母、小写字母、数字、空格、逗号的个数。

代码：

#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;

}