实验六

part 2

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

int main() {
    string filename1, filename2, newfilename;

    cout << "输入要合并的两个文件名: ";
    cin >> filename1 >> filename2;
    cout << "输入合并后新文件名: ";
    cin >> newfilename;

    ofstream fout;        
    ifstream fin;        


    fin.open(filename1);   
    if (!fin.is_open()) {  
        cerr << "fail to open file " << filename1 << endl;
        system("pause");
        exit(0);
    }

    fout.open(newfilename);    
    if (!fin.is_open()) { 
        cerr << "fail to open file " << newfilename << endl;
        system("pause");
        exit(0);
    }

    char ch;
    
    while (fin.get(ch))
        fout << ch;

    fin.close(); 

    fout << endl; 


    fin.open(filename2);   
    if (!fin.is_open()) {  
        cerr << "fail to open file " << filename2 << endl;
        system("pause");
        exit(0);
    }
    while (fin.get(ch))
        fout << ch;
    fout << endl;
    fout << "merge sucessfully.";
    fin.close();     
    fout.close();    

    system("pause");

    return 0;
}

main。cpp

截图

 

part 3

 1

//这个头文件里包含了可用工具函数的声明 

#include <string>
using std::string;

// 函数声明
// 返回当前系统时间，格式诸如20190607
string getCurrentDate();  
 

untils.h

#include "utils.h"
#include <ctime>
using std::string;

const int SIZE = 20;

// 函数功能描述：返回当前系统时间
// 参数描述：无参数
// 返回值描述：以string类型返回系统当前日期，格式诸如20190611
string getCurrentDate() {
    
    time_t time_seconds = time(0);
    struct tm now_time;
    localtime_s(&now_time, &time_seconds); // 使用了更安全的localtime_s()
    
    char date[SIZE];

    strftime(date, SIZE, "%Y%m%d", &now_time);
    
    return (string(date));
} 

untils.cpp

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

using namespace std;

int main() {
    ifstream fin;
    ofstream fout;

    string filename1;
    int num, totalline = 0;
    cout << "输入名单列表文件名：";
    cin >> filename1;
    cout << "输入随机抽点人数：";
    cin >> num;
    fin.open(filename1, ios_base::in);
    if (!fin.is_open()) {
        cerr << "fail to open file " << filename1 << endl;
        system("pause");
        exit(0);
    }

    string temp;
    string a[100];

    if (fin) {
        while (getline(fin, temp)) {
            a[totalline++] = temp;
        }
        fin.close();

    }



    string filename;

    filename = getCurrentDate() + ".txt";

    cout << "new file name is " << filename << endl;
    srand(std::time(0));
    for (int i = 0; i < num; i++) {

        int line;
        int random = rand();
        line = rand() % totalline;
        cout << a[line] << endl;
        fout.open(filename, ios_base::app);
        fout << a[line] << endl;
        fout.close();

    }



    system("pause");

    return 0;
}

main.cpp

截图

2

#include<string.h>
#include<fstream>
#include<iostream>
using namespace std;
int main() {
    ifstream in("article.txt");
    long ln=0,cn=0,wn=0;
    char str[1000];
    while (in.getline(str, 1000))
    {
        for (int i=0;i<strlen(str);i++)
        {
            cn++;
            if (str[i] == ' '||str[i]=='...'||(str[i]=='.'&&str[i + 1]!= '.'&&str[i - 1] != '.') || str[i] == ',')
            {
                wn++;
            }
        }
        ln++;
    }
    wn--;
    cout<< "行数：" << ln<< endl 
        << "字符数：" << cn<< endl
        <<"单词数："<<wn<< endl;
    in.close();
    system("pause");
    return 0;
}

main.cpp

截图

 

标签：main,string,int,filename1,实验,time,include
来源： https://www.cnblogs.com/zxz2425405395/p/11030962.html