#include <iostream>
#include <fstream>
using namespace std;
void main() {
    /*int A[20]{ 3,7,3,2,4,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3 };
    ofstream fout("D://text//1.txt", ios_base::ate | ios_base::binary);
    if (fout.is_open()) {
        fout.write((char*)A, sizeof(A));
    }
    fout.close();
    int B[20] = { 0 };
    fstream fin("D://text//1.txt", ios_base::in | ios_base::binary);
    if (fin.is_open()) {
        fin.read((char*)B, sizeof(B));
    }
    fin.close();
    for (int i = 0; i < 20; i++) {
    cout << B[i] << " ";
    }*/
    int a = 888, b = 4, tmp, j = 0, p;
    fstream f("D://text//1.txt", ios_base::app | ios_base::in | ios_base::binary);
    if (f.is_open()) {
        f.seekp(ios_base::beg);
        for (int i = 0; i < 20; i++) {
            p = f.tellp();
            f.read((char*)&tmp, sizeof(tmp));
            if (tmp == b) {
                f.write((char*)&a, sizeof(a));
                f.flush();
                j = 2;
            }
            else {
                j = 1;
            }
            if (j == 1) {
                f.seekp(sizeof(int)*p, ios_base::beg);
            }
            if (j == 2) {
                f.seekg(sizeof(int)*p - 1, ios_base::beg);
            }
        }
        int B[20] = { 0 };
        f.read((char*)B, sizeof(B));
        f.close();
        for (int i = 0; i < 20; i++) {
        cout << B[i] << " ";
        }
    }
    system("pause");
}

/*int A[20]{ 3,7,3,2,4,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3 };
    ofstream fout("D://text//1.txt", ios_base::ate | ios_base::binary);
    if (fout.is_open()) {
        fout.write((char*)A, sizeof(A));
    }
    fout.close();
    int B[20] = { 0 };
    fstream fin("D://text//1.txt", ios_base::in | ios_base::binary);
    if (fin.is_open()) {
        fin.read((char*)B, sizeof(B));
    }
    fin.close();
    for (int i = 0; i < 20; i++) {
    cout << B[i] << " ";
    }*/

int a = 888, b = 4, tmp, j = 0, p;
    fstream f("D://text//1.txt", ios_base::app | ios_base::in | ios_base::binary);
    if (f.is_open()) {
        f.seekp(ios_base::beg);
        for (int i = 0; i < 20; i++) {
            p = f.tellp();
            f.read((char*)&tmp, sizeof(tmp));
            if (tmp == b) {
                f.write((char*)&a, sizeof(a));
                f.flush();
                j = 2;
            }
            else {
                j = 1;
            }
            if (j == 1) {
                f.seekp(sizeof(int)*p, ios_base::beg);
            }
            if (j == 2) {
                f.seekg(sizeof(int)*p - 1, ios_base::beg);
            }
        }
        int B[20] = { 0 };
        f.read((char*)B, sizeof(B));
        f.close();
        for (int i = 0; i < 20; i++) {
        cout << B[i] << " ";
        }
    }