编了个简单的程序如下：

#include <iostream>

using namespace std;

int main()
{
  char ch;

  // 初始化各个计数器
  int aCnt = 0, eCnt = 0, iCnt = 0, oCnt = 0, uCnt = 0;
  int spaceCnt = 0, tabCnt = 0, newlineCnt = 0;

  while (cin.get(ch)){
      // 若ch是元音字母以及空格，制表符和换行符，将相应计数器加1
      switch (ch) {
         case 'a':
         case 'A':
               ++aCnt;
               break;
         case 'i':
         case 'I':
               ++iCnt;
               break;
         case 'o':
         case 'O':
               ++oCnt;
               break;
         case 'u':
         case 'U':
               ++uCnt;
               break;
         case ' ':
               ++spaceCnt;
               break;
         case '\t':
               ++tabCnt;
               break;
         case '\n':
               ++newlineCnt;
               break;

      }
  }

  // 输出结果
  cout << "Numbers of vowel a: \t" << aCnt << "\n"
       << "Numbers of vowel e: \t" << eCnt << "\n"
       << "Numbers of vowel i: \t" << iCnt << "\n"
       << "Numbers of vowel o: \t" << oCnt << "\n"
       << "Numbers of vowel u: \t" << uCnt << "\n"
       << "Numbers of space character: \t" << spaceCnt << "\n"
       << "Numbers of Tab character: \t" << tabCnt << "\n"
       << "Numbers of newline character: \t" << newlineCnt << endl;

  return 0;
       
}

运行结果时，不知道怎么终止，用"end"也不行，搞得很是郁闷。
望高手指点。

附送美女：