Tag Archives: c++

十 18

c++ 写入文件、读取文件

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c++ 写入文件、读取文件

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#include <iostream>
#include <string>
#include <fstream>
 
using namespace std;
 
// 写入
void write(char * filePath, char * data)
{
    // 以写模式打开文件
    ofstream outfile;
    outfile.open(filePath);
 
    cout << "Writing to the file" << endl;
    cout << "Enter your name: ";
    cin.getline(data, 100);
 
    // 向文件写入用户输入的数据
    outfile << data << endl;
 
    cout << "Enter your age: ";
    cin >> data;
    cin.ignore();
 
    // 再次向文件写入用户输入的数据
    outfile << data << endl;
 
    // 关闭打开的文件
    outfile.close();
}
 
// 读取
void read(char * filePath, char * data)
{
    // 以读模式打开文件
    ifstream infile;
    infile.open(filePath);
 
    cout << "Reading from the file" << endl;
    infile >> data;
 
    // 在屏幕上写入数据
    cout << data << endl;
 
    // 再次从文件读取数据，并显示它
    infile >> data;
    cout << data << endl;
 
    // 关闭打开的文件
    infile.close();
}
 
int main() {
 
    char data[100];
    char filePath[64] = "afile.dat";
 
    // 写入
    write(filePath, data);
 
    // 读取
    read(filePath, data);
 
    system("pause");
 
    return 0;
}

 

十 17

c++ 随机数

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c++ 随机数

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#include <string>
#include <random>
#include <functional> // bind()
 
using namespace std;
 
int main() {
    random_device rd;
    mt19937 gen = mt19937(rd());
    uniform_real_distribution<> dis(40, 100);
    auto randFun = bind(dis, gen);
 
    for(int i=0; i<5; i++)
    {
        cout << (int)randFun()  << "\t" << (int)randFun()  << "\t" << (int)randFun()  << endl;
    }
}