10.27

#include<iostream>
#include<string>
#include<iomanip>
class info
{
public:
    
    info(std::string theName = "a12", std::string thePhone = "112", std::string theCity = "s12", int number = 0):nickname(theName), contact(thePhone),city(theCity),n(number) {}
    
    void print() const;
    
    std::string nickname;
    std::string contact;
    std::string city;
    int n;    
};

void info::print() const
{
    std::cout << std::left << std::setw(15) << "称呼:" << std::left << std::setw(15) << nickname << std::endl;
    std::cout << std::left << std::setw(15) << "联系方式" << std::left << std::setw(15) << contact << std::endl;
    std::cout << std::left << std::setw(15) << "所在城市" << std::left << std::setw(15) << city << std::endl;
    std::cout << std::left << std::setw(15) << "预定人数" << std::left << std::setw(15) << n << std::endl; 
}
#include"Info.hpp"
#include<iostream>
#include<string>
#include<vector>

int main()
{
    std::vector<info> audience_info_list;
    std::cout << "录入信息:
" << std::endl;
    std::cout << "昵称/称呼 联系方式电话/邮箱 城市 预定参加人数" << std::endl;
    
    const int capacity = 100;
    int numbers = 0;
    
    std::string inputN, inputP,inputC;
    int inputNu;
    while(std::cin >> inputN )
    {
        std::cin >> inputP;
        std::cin >> inputC;
        std::cin >> inputNu;
        
        info a(inputN, inputP, inputC, inputNu);
        audience_info_list.push_back(a);
        
        numbers += inputNu;
        if( numbers > capacity)
        {
            numbers -= inputNu;
            audience_info_list.pop_back();
            std::cout << "对不起只剩下" << capacity - numbers << "个座位" << std::endl;
            std::cout << "1.输入u,更新(update)预定数据
2.输入q,退出
你的选择:";
            char p;
            std::cin >> p; 
            
            if(p == 'q')
            {
                break;
            }
            
            else if(p == 'u')
            {
                
            }
        }
    }
    
    std::cout << "截止目前,一共有" << numbers << "位听众预定参加。预定信息如下:" << std::endl;
    
    for(auto const &i : audience_info_list)
    {
        i.print();
    }     
    
    return 0;
}

#include<iostream>
#include<string>

class textcoder
{
public:
    
    textcoder(std::string theText = "a12"): text(theText) {}
    
    std::string encoder();
    std::string decoder();
    
private:
    std::string text;
};

std::string textcoder::encoder()
{
    for(auto &a:text)
    {
        if( ( ( a < 'v') && ( a >= 'a')) || ((a < 'V') && (a >= 'A')))
        {
            a += 5; 
        }
        
        else if( ((a >= 'v') &&  (a <= 'z') ) || ((a >= 'V') && (a <= 'Z')))
        {
            a -= 21;
        }
        
    }
    
    return text;
}


std::string textcoder::decoder()
{
    for(auto &a:text)
    {
        if( ( ( a <= 'z') && ( a > 'e')) || ((a <= 'Z') && (a > 'E')))
        {
            a -= 5; 
        }
        
        else if( ((a >= 'a') &&  (a <= 'e') ) || ((a >= 'A') && (a <= 'E')))
        {
            a += 21;
        }
    }
    
    return text;
}
#include "textcoder.hpp" 
#include <iostream> 
#include <string> 

int main() 
{ 
    using namespace std; 
    
    string text, encoded_text, decoded_text; 
    cout << "输入英文文本: "; 
    while (getline(cin, text)) 
    { 
        encoded_text = textcoder(text).encoder(); // 这里使用的是临时无名对象 
        cout << "加密后英文文本:	" << encoded_text << endl; 
        
        decoded_text = textcoder(encoded_text).decoder(); // 这里使用的是临时无 名对象 
        cout << "解密后英文文本:	" << decoded_text << endl; 
        cout << "
输入英文文本: "; 
    } 
}

实验总结:
1.string这个类有自己的确认长度函数length() size()
2.可以直接用+实现两个字符串的相加
3.auto  string.find查找某个字符第一次出现的位置4.
4.auto string. substr(a,b)取字串从a~b
5.string.replace(a,b,c)把串中a~b的全部替换成c
6.a = string.swap(b)交换
7.int x = stoi(a)把字符串a全部转换为Int
8.cin.ignore(numeric_limits<streamsize>::max(), ' ');清空输入缓存区 

9.capacity检测数组空间大小,但是这个大小是可用大小,不一定是有值的位置的大小


原文地址:https://www.cnblogs.com/2967271912lala/p/15502632.html