实验6

#include<iostream>
#include<string>
#include<fstream>
using namespace std;
int main(){
    ofstream ofapp("3.txt",ios::app);
    string add;
    if(!ofapp){cerr<<"open error"<<endl;}
    getline(cin,add);
    ofapp<<add<<endl;
    ofapp.close();
    system("pause");
    return 0;
}

#include<iostream>
#include<fstream>
#include<string>
#include<ctime>
#include<cstdlib>
#include "utils.h"
using namespace std;
int main(){
    int i=0,j,n;
    int result,mo;
    fstream fread0("list.txt");
    string name[100];
    string line;
    while(getline(fread0,line)){
        name[i]=line;
        i++;
    }
    cin>>n;
    srand(time(NULL));
    int a[100];
    for(j=0;j<n;j++)
    {
        while(1){
            result=rand()%i;
            mo=1;
            for(int k=0;k<j;k++)
            {
                if(result==a[k])  mo=0;
            }
            if(mo==1) break;
        }
        a[j]=result;
    }
    string filename;

    filename = getCurrentDate()+".txt";

    fstream fout(filename,ios::app);

    for (i = 0;i < n;i++) {
        fout << name[a[i]] << endl;
    }
    system("pause");
    return 0;
}