C++ primer-练习5.12

题目：修改统计元音字母的程序，使其能统计以下含有两个字符的字符序列的数量：ff,fl,fi。

#include<iostream>

using namespace std;

int main()
{
	char ch;
	int ffcnt, flcnt, ficnt;
	ffcnt = flcnt = ficnt = 0;
	while (cin >> ch)
	{
		switch (ch)
		{
		case'f':while (cin >> ch)
		{
			switch (ch)
			{
			case'f':++ffcnt;
				break;
			case'l':++flcnt;
				break;
			case'i':++ficnt;
				break;
			}
			break;
		}

		}
	}
	cout << "ff有" << ffcnt << "个" << endl
		<< "fl有" << flcnt << "个" << endl
		<< "fi有" << ficnt << "个" << endl;
		
	return 0;
}