实验6

#include <iostream>
#include <fstream>   
#include <string>
#include <cstdlib>
using namespace std;

int main() {
    string file;
    ofstream fout;
    cout<<"open the file:";
    cin>>file;
    fout.open(file,ios_base::app);
    if(!fout.is_open())
    {
        cout<<"fail to open"<<endl;
        exit(0);
     } 
     fout<<endl<<"merge successfully"<<endl;
     fout.close();
     return 0;
}

#include <iostream>
#include <string>
#include "utils.h"
#include <fstream>
#include <ctime>
#include <cstdlib>

using namespace std;

int main() {
    
    string filename;
    
    filename = getCurrentDate();
    
    cout << filename << endl;
    
    string file;
    int n;
    ifstream fin;
    ofstream fout;
    cout<<"输入名单列表的文件名：";
    cin >>file;
    cout<<"输入随机抽取人数：";
    cin>>n; 
    fin.open(file);
    if(!fin.is_open())
    {
        cerr<<"fail to open"<<file<<endl;
        system("pause");
        exit(0);
    }
    fout.open(filename);
    if(!fout.is_open())
    {
        cerr<<"fail to open"<<filename<<endl;
        system("pause");
        exit(0);
    }
    srand(time(0));
    int line=0,ran;
    string t[100],a;
    while (getline(fin,a))
    {
        t[line++]=a;
    }
    while(n--)
    {
        ran=rand()%83;
        fout<<t[ran]<<endl;
        cout<<t[ran]<<endl;
    }
    fin.close();
    fout.close();
    return 0;
}

#include<iostream>
#include<fstream>
#include<string>
using namespace std;
int main()
{
    string file;
    ifstream fin;
    int num=0,num1=0,line=0;
    cout<<"输入要统计的英文文本文件名：";
    cin>>file;
    fin.open(file);
    if(!fin.is_open())
    {
        cout<<"fail to open"<<endl;
        return 0;
    }
    string a;
    string s[1000];
    int x,i;
    while(getline(fin,a)){
        s[line]=a;
        line++;
        x=a.length();
        for(i=0;i<x;i++){
            if(a[i]==‘ ‘)
            num1++;
        }
        num1++;
    }
    for(i=0;i<line;i++)
    {
        x=s[i].length();
        num+=x;
    }
     fin.close();
     cout<<"字符数："<<num<<endl;
     cout<<"单词数："<<num1<<endl; 
     cout<<"行数："<<line<<endl; 
     return 0; 
}