C++ Primer（第5版） 练习 5.12

练习 5.12 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和fi。

环境：Linux Ubuntu（云服务器）

工具：vim

代码块

/*************************************************************************
	> File Name: ex5.11.cpp
	> Author: 
	> Mail: 
	> Created Time: Sun 11 Feb 2024 12:48:36 PM CST
 ************************************************************************/

#include<iostream>
#include<vector>
using namespace std;

int main(){
    unsigned aCnt = 0, eCnt = 0, iCnt = 0, oCnt = 0, uCnt = 0;
    unsigned space = 0, tab = 0, newline = 0;
    unsigned ff = 0, fl = 0, fi = 0;
    string ch;

    while(getline(cin, ch)){
        ++newline;
        for(auto s = ch.begin(); s != ch.end(); s++){
            switch(*s){
                case 'a':
                case 'A': ++aCnt; break;
                case 'e':
                case 'E': ++eCnt; break;
                case 'i':
                case 'I': ++iCnt; break;
                case 'o':
                case 'O': ++oCnt; break;
                case 'u':
                case 'U': ++uCnt; break;
                case ' ': ++space; break;
                case '\t': ++tab; break;
                default: break;
            }
        }
        for(auto s = ch.begin(); s != ch.end(); s++){
            if(*s == 'f'){
                if(*(s + 1) == 'f'){
                    ff++;
                }
                else if(*(s + 1) == 'l'){
                    fl++;
                }
                else if(*(s + 1) == 'i'){
                    fi++;
                }
            }
        }
    }

    cout<<"Number of vowel a, A:\t"<<aCnt<<endl;
    cout<<"Number of vowel e, E:\t"<<eCnt<<endl;
    cout<<"Number of vowel i, I:\t"<<iCnt<<endl;
    cout<<"Number of vowel o, O:\t"<<oCnt<<endl;
    cout<<"Number of vowel u, U:\t"<<uCnt<<endl;
    cout<<"Number of space:\t"<<space<<endl;
    cout<<"Number of tab:\t\t"<<tab<<endl;
    cout<<"Number of newline:\t"<<newline<<endl;
    cout<<"Number of ff:\t\t"<<ff<<endl;
    cout<<"Number of fl:\t\t"<<fl<<endl;
    cout<<"Number of fi:\t\t"<<fi<<endl;
    
    return 0;
}

运行结果显示如下