程序无法正常运行 [英] program won't run properly

问题描述

以下代码摘自Lippman的最新版C ++ Primer

The following code is from the recent edition of C++ Primer by Lippman

#include <iostream>
using std::cin;
using std::cout;
using std::endl;


int main()
{
    char ch;
    // initialize counters for each vowel
    int aCnt = 0, eCnt = 0, iCnt = 0, 
        oCnt = 0, uCnt = 0;

    while (cin>>ch ) {
    	// if ch is a vowel, increment the appropriate counter
    	switch (ch) {
    		case ''a'':
    			++aCnt;
    			break;
    		case ''e'':
            
    			++eCnt;
    			break;
    		case ''i'':
            
    			++iCnt;
    			break;
    		case ''o'':
            
    			++oCnt;
    			break;
    		case ''u'':
                 
    			++uCnt;
    			break;
    	}
    }
    // print results
    cout << "Number of vowel a: \t" << aCnt << ''\n''
         << "Number of vowel e: \t" << eCnt << ''\n''
         << "Number of vowel i: \t" << iCnt << ''\n''
         << "Number of vowel o: \t" << oCnt << ''\n''
         << "Number of vowel u: \t" << uCnt << endl;
        system("pause");
    return 0;</iostream>

它显示了极差的结果.我不能让它读取文件.其他时间
跑步时，我输入字符并按^ z，然后在长时间停顿后显示.
如何使其正常工作.

It shows its results extremly poorly. I can''t make it read files. Other times
upon running, I type in characters and hit ^z then it shows after a long pause.
How can I make it work properly.

推荐答案

while循环没有退出条件.

我如何使其正常工作?" —好吧，这取决于您适当"的意思.如果需要，请在while行后添加退出条件，例如

The while loop has no exit condition.

"How can I make it work properly?" — well, it depends what do you mean "properly". If you want, add a condition for exit right after line with while, such as

while (cin>>ch ) {
   if (ch == 'q') break;
   switch (ch) {
      //...
   }
}

在这种情况下，循环将在"q"(退出")上退出.

—SA

in this case the loop will exit on ''q'' ("quit").

—SA

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