今天买的ESSential C++ 这本书到了，粗略学习了第一章，主要回顾了几个重要的知识点，下面将介绍今天学习的内容。
自己编写了一个小程序，里面包含了C++一些知识点的基本使用，可以当做一个小例子练手。
该程序主要实现以下功能：
1）创建了斐波那契数列等一系列其他数列，显示其中的两个数，用户填写第三个数。
2）判断用户的数据是否正确，并询问用户是否愿意继续填写数据。
3）将用户的成绩按照名字存放在TXT文件中，如果想要查询成绩则输入名字进行查询。
以下是代码：
# include <iostream>
# include <fstream>
# include <string>
# include <vector>
# include <cstdlib>
# include <ctime>
using namespace std;
int main()
{
// 初始化数列 包含 Fibonacci ，lucas 数列的前六个数
const int size = 4;
vector<int> fibo = {
1, 1, 2, 3, 5, 8 };
vector<int> luca = {
1, 3, 4, 7, 11,18 };
vector<int> pell = {
1, 2, 5, 12, 29,70 };
vector<int> squre = {
1, 4, 9, 16, 25, 36 };
//将指针初始化
vector <int> *add[4] = {
&fibo , &luca , &pell ,&squre };
string name,name1;
int right = 0, total = 0, value = 0;
int index = 0;//索引，在四个数列中随机选取一个数列
int index1 = 0;
cout << "please input your name" << endl;
cin >> name;
char next = 'n';
char go = 'y';
while (go == 'y' || go == 'Y' )
{
srand((unsigned)time(0));//产生何种序列种子
index = rand() % size;//产生0—3的随机数
index1 = rand() % 4;//产生0-3的随机数
//填写数字
cout << "请按照规律填写数字" << " " << add[index]->at(index1)
<< " " << add[index]->at(index1 + 1) << endl;
cin >> value;
//判断输入的值是否正确
if (value != add[index]->at(index1 + 2))
{
cout << "your anwser is wrong ,would you like to try again ? y/n" << endl;
cin >> go;
total++;
}
else
{
cout << "congratulations!,would you like to try again?y/n" << endl;
cin >> go;
right++;
total++;
}
//将数据写进txt文件
ofstream outfile("han.txt", ios_base::app);
if (!outfile)//确认是否打开
cout << "file is not open" << endl;
else
{
//文件输入数据
outfile << name << ' ' << right << ' ' << total << endl;
}
}
cout << "game is over ，would you like to know your achievement? y/n" << endl;
cin >> next;
if (next == 'y' || next == 'Y')
{
ifstream infile("han.txt");
if (!infile)
cout << "error" << endl;
else
{
cout << "输入你想查询的成绩" << endl;
cin >> name1;
vector <string> read;
string read1;
for (int i = 0;!infile.eof() ; i++)
{
infile >> read1;
read.push_back(read1);
}
//判断文件中是否有名字
for (int i = 0; i < read.size(); i++)
{
if (read[i] == name1)
cout << "your achievement is " << ' ' << read[i]
<< ' ' << read[i + 1] << ' ' << read[i + 2] << endl;
}
//
}
}
}