Help in Unix on bash

Design and implement C++ program (a3part2.cpp) with the password file (/etc/passwd) to do the following tasks.

root:x:0:0:root:/root:/bin/bash

bin:x:1:1:bin:/bin:/sbin/nologin

daemon:x:2:2:daemon:/sbin:/sbin/nologin

adm:x:3:4:adm:/var/adm:/sbin/nologin

Task1.

Design and implement a class (passwd) which contains member variables for each field of the password file (/etc/passwd). You will have an array (passwdArray) of which each element is an instance-object of passwd class (from each record of the passwd file). Reading the password file (/etc/passwd), each record will be instantiated as an object of the passwd class and set to be an element of an array.

Output each record (object) in the array (passwdArray) to a file (a3p2task1.txt).

Task2

Output each passwd object in the passwdArray, into a binary file (a3p2task2.bin).

Then your program is to read this binary file (a3p2task2.bin), reading each passwd object from the file, into another password array (passwdArray2). Then output each object as you have done in Task1 to a file (a3p2task2.txt).

Task #3

Create a Map object (passwdMap) where its key is uid and its value is gid. Populate map entry from each object in passwdArray. Print each entry in passwdMap in ascending order by the key value.

this is part of it and also for task 1 and 2

#include

#include

using namespace std;

class Student

{

public:

char name[10];

char address[10];

char Gender;

char DOB[10];

Student()

{}

};

int main()

{

cout<<" Writting on file: Student1.txt ";

Student *p=new Student;

cout<<1<<": ";

cin>>p->name;

cout<<" ";

// to append use ios::app

// ofstream osfile("Student1.txt",ios::binary|ios::app);

ofstream osfile("Student1.txt",ios::binary);

osfile.write((char*)p,sizeof(Student));

osfile.close();

cout<<" reading Student1.txt ";

Student *p2=new Student;

ifstream isfile("Student1.txt",ios::binary);

isfile.read((char*)p2,sizeof(Student));

isfile.seekg(0);

isfile.close();

cout<<1<<": ";

cout<name;

cout<<" ";

return 0;

}

this is for task 3

#include  

#include  

#include 

int main() 

{ 

 std::map wordcounts; 

 std::string s; 

 while (std::cin >> s && s != "end") 

 ++wordcounts[s]; 

 while (std::cin >> s && s != "end") 

 std::cout << s << ' ' << wordcounts[s] << ' '; 

}