2023.5.8

#include <iostream>
using namespace std;
#include <fstream>
#include <iomanip>
void test()
{
    int num;
    cout << "请输入一个十进制整数：" << endl;
    cin >> num;
    //十进制输出
    cout << "十进制输出为：" << num << endl;
    //八进制输出
    cout << "八进制输出为："<<oct << num << endl;
    //十六进制输出
    cout << "十六进制输出为：" << hex << num << endl;
}
int main()
{
    test();
    return 0;
}

//11-9
#include <iostream>
using namespace std;
#include <fstream>
#include <iomanip>
#include <string>
void test()
{
    ofstream ofs;
    ofs.open("test1.txt", ios::out);
    ofs << "我说我不再拥有" << endl;
    ofs << "你说你还爱我" << endl;
    ofs << "我说我说我开不了口" << endl;
    ofs.close();
}
void test01()
{
    string buf;
    int counter = 0;
    ifstream ifs("test1.txt",ios::in);
    ofstream ofs("test2.txt",ios::out);
    if (!ifs.is_open())
    {
        cout << "文件打开失败" << endl;
        return;
    }
    while (getline(ifs, buf))
    {
        ofs << ++counter << "." << buf << endl;
    }
    ifs.close();
    ofs.close();
}
int main()
{
    test();
    test01();
    return 0;
}

//11-10
#include <iostream>
using namespace std;
#include <fstream>
#include <iomanip>
#include <string>
void test()
{
    int num = 0;
    char c;
    char a ='我';
    ifstream ifs;
    ifs.open("test1.txt", ios::in);
    if (!ifs.is_open())
    {
        cout << "文件打开失败" << endl;
    }

    while ((c = ifs.get()) != EOF)
    {

        if (a == c)
        {
            num++;
        }
    }
    ofstream ofs;
    ofs.open("test2.txt", ios::out);
    ofs <<"‘我’的个数为：" << num << endl;
    ofs.close();
    ifs.close();
}
int main()
{
    test();
    return 0;
}