(补)抽奖用小代码

使用语言C++14.

这个小代码里有些功能是想拓展的但没有写.
现在的功能是配备一份names.txt的文件.里面是每行一个@name的格式.
在run这个程序的时候,输入任何不是@的字符就会开始抽奖.
很久之前写的,也比较乱.但问题是有段日子没有写C++了…重新捡起来需要点时间.

  
#include <iostream>
#include <map>
#include <string>
#include <fstream>
#include <cstdlib>
#include <ctime>
#include <random>

using namespace std;


int main(int argc, const char * argv[]) {
    cout << "Instruction in case I forgot!" << endl;
    cout << endl;
    cout << "if you go with ./a.out -f that means include a file call names.txt to include names to raffle" << endl;
    cout << "add -reset at front will empty your names.txt" << endl;
    cout << "otherwise, whatever you add to raffle will be automatically add to names.txt as well" << endl;
    cout << endl;
    cout << "add username with @!" << endl;
    cout << "any input without @ will start the raffle!" << endl;

    std::map<int,string> theMap;
    int index = 0;

    if( argc > 1 ){
        for(int i = 1 ; i < argc ; i++){
            if(argv[i][0] == '-'){

                if(argv[i][1] == 'f'){//file
                    //find names.txt
                    ifstream file{"names.txt"};
                    string s;

                    while(file >> s){
                        string tb = s;
                        theMap.insert(pair<int,string>(index,tb));
                        index++;
                    }
                }//end of file interface
                if(argv[i][1] == 'r'){//reset
                    //find names.txt
                    //then clean it
                    ofstream newFile("names.txt", std::ofstream::app);
                    newFile << "something";
                    newFile.close();

                }//end of reset
            }
        }
    }//end of argc

    //mutually
    string w;
    while(cin >> w){
        if(w[0] == '@'){
            theMap.insert(pair<int,string>(index,w));
            index++;
            //we add it into our names.txt as well
            //....
            //
        }else break;
    }
    //raffle here
    int rdmb = 0;
    random_device rd;
    mt19937 eng(rd());
    uniform_int_distribution<> distr(0,index);
    rdmb = distr(eng);
    cout << "test:" << theMap[rdmb] << endl;

    //for testing

    //we print all the content in the map
    cerr << "ramdom num: " << rdmb << endl;
    for (auto it = theMap.begin(); it != theMap.end(); ++it) {
        cerr << '\t' << it->first
        << '\t' << it->second << '\n';
    }
    cerr << endl;

    //2>/dev/null

}

复录:Makefile.这次不需要使用.

  
CXX = g++
CXXFLAGS = -std=c++14 -Wall -Werror=vla -MMD -L/usr/X11/lib
EXEC = nameOfTheProject
OBJECTS = main.o sub.o
DEPENDS = ${OBJECTS:.o=.d}

${EXEC}: ${OBJECTS}
        ${CXX} ${CXXFLAGS} ${OBJECTS} -o ${EXEC}  -lX11

-include ${DEPENDS}

clean:
        rm ${OBJECTS} ${EXEC} ${DEPENDS}
.PHONY: clean

再复录:compile代码,试图唤醒沉睡的记忆.

g++ -std=c++14 -o a.out main.cpp