实验六 模板类和文件I/O

标签：文件 int namespace Vector 实验 include open 模板 out

实验任务3

#include<iostream>
#include<fstream>
#include<array>
#define N 5
int main(){
    using namespace std;
    array<int,N> x{97,98,99,100,101};
    ofstream out;
    out.open("data.txt",ios::binary);
    if(!out.is_open()){
        cout<<"fail to open data1.dat\n";
        return 1;
    }
    out.write(reinterpret_cast<char *>(&x),sizeof(x));
    out.close();
}

#include<iostream>
#include<fstream>
#include<array>
#define N 5
int main(){
    using namespace std;
    array<int,N>x;
    ifstream in;
    in.open("data.txt",ios::binary);
    if(!in.is_open()){
        cout<<"fail to open data1.dat\n";
        return 1;
    }
    in.read(reinterpret_cast<char *>(&x),sizeof(x));
    in.close();
    for(auto i=0;i<N;i++)
    cout<<x[i]<<",";
    cout<<"\b\b\n";
}

 

 

#include<iostream>
#include<fstream>
#include<array>
#define N 5
int main(){
    using namespace std;
    array<char,N>x;
    ifstream in;
    in.open("data.txt",ios::binary);
    if(!in.is_open()){
        cout<<"fail to open data1.dat\n";
        return 1;
    }
    in.read(reinterpret_cast<char *>(&x),sizeof(x));
    in.close();
    for(auto i=0;i<N;i++)
    cout<<x[i]<<",";
    cout<<"\b\b\n";
}

 

 实验任务4

Vector.h

#pragma once
#include<iostream>
using namespace std;
template<typename T>
class Vector{
    public:
        Vector(int n):size{n}{
        value=new T[n];        
        }
        Vector(int n,T v):size{n}{
        value=new T[n];
        for(int i=0;i<n;i++)
        value[i]=v;
        }
        Vector(const Vector<T> &a):size{a.size}{
            value=new T[size];
            for(int i=0;i<size;i++)
            value[i]=a.value[i];
        }
        T &operator[](int i){
            return value[i];
        }
        int get_size() const{
        return size;
        }
        T &at(int index){
            return value[index];
        }
        friend void output(const Vector<T> &a){
        for(int i=0;i<a.size;i++)
        cout<<a.value[i]<<",";
        cout<<"\b\b\n";
        }
    private:
        int size;
        T *value;
};

task4.cpp

#include <iostream>
#include "Vector.h"

void test() {
    using namespace std;

    int n;
    cin >> n;

    Vector<double> x1(n);
    for (auto i = 0; i < n; ++i)
        x1.at(i) = i * 0.5;

    output(x1);

    Vector<int> x2(n, 66);
    Vector<int> x3(x2);

    output(x2);
    output(x3);

    x2.at(0) = 88;
    output(x2);

    x3[0] = 99;
    output(x3);
}

int main() {
    test();
}

实验任务5

#include <iostream>
#include<fstream>
#include<string>
using namespace std;
void output() {
    string a[27][27] = { " " };
    int i, j, n = 0;
    for (i = 1; i < 27; i++) {
        a[i][0] = to_string(i);
        a[0][i] = 97 + n;
        n++;
    }
    for (i = 1; i < 27; i++) {
        n = i;
        for (j = 1; j < 27; j++) {
            if (65 + n > 90)
            {
                a[i][j] = 65 + n - 26;
            }
            else {
                a[i][j] = 65 + n;
            }
            n++;
        }

    }


    ofstream out;
    out.open("cipher_ke.txt");
    if (!out.is_open()) {
        cout << "fail to open cipher_key.txt to write" << endl;
    }

    for (i = 0; i < 27; i++) {

        for (j = 0; j < 27; j++) {
            cout << a[i][j] << " ";
            out << a[i][j] << " ";
        }
        cout << endl;
        out << endl;
    }
}

int main() {
    output();
}

 

标签：文件,int,namespace,Vector,实验,include,open,模板,out
From： https://www.cnblogs.com/DeviIMayCry/p/16952006.html