Question

Serve the user in two phases:

In C++
Phase A:
(1) Read all input records one by one into arrays in main memory.
(2) Display all the records on the screen in the order they are read from the input data file.
(3) Do a Selection Sort (must be implemented as a function) to sort the records in ascending
order on STUDENT_ID and display all the full records correctly in the correct order after
sorting.
Phase B:
(1) Then, the user can do the following until he/she chooses to exit Task B:
(1a) Search for a STUDENT by STUDENT_ID (must be implemented as a function)
(1b) If the search STUDENT_ID is found, then after (1a), the system displays the complete
information of this STUDENT on the screen. Then, the user can either subtract or add a
particular number of cents (an integer) to update the current BALANCE of this student once.
(1c) If the search STUDENT_ID is not found, then after (1a), the system displays the
message “Student not found.”
(2) When the user chooses to quit Phase B Step (1), the system writes all records with the
current values for the data fields from the arrays (from slots 0 to the last slots with data) into
a new output file in the same folder and the file name is to be “infoout.txt.” The
record format is to be the same record format as the input file. We expect the order of
records in this new file to be in ascending order on STUDENT_ID.
II. Your program displays “Updating of records done and the new file is: infoout.txt”
and return to the Main Menu

B12345 Abot Mark 600
G98733 Albert Pete 100
A93832 Waltz Manny 300
A32334 Leng Katy 1000
E32145 Rock Keith 80
A09121 Shaffer John 1050
A94321 Lewis Stephen 500
A83243 Chandler Lilly 6300
E38273 Johns Adam 5200

Answer 1

#include<iostream>

#include<fstream>

using namespace std;

class student

{

//data variables

public:

string name,id,current;//

};

//method to sort using selection sort

void selectionSort(student s[],int length)

{

int k;

string temp;

for(int i = length -1; i > 0; --i)

{

k = 0;

for(int j = 1; j <= i; ++j)

{

//sorting

if(s[j].name >s[k].name)

{

k = j;

}

//swapping

temp = s[k].name;

s[k].name = s[i].name;

s[i].name = temp;

temp =s[k].id;

s[k].id=s[i].id;

s[i].id=temp;

string tem= s[k].current;

s[k].current = s[i].current;

s[i].current =tem;

}

}

}

void display(student s[],int n)

{

int i=0;

while(i<n)

{

cout<<s[i].id<<' '<<s[i].name<<' '<<s[i].current<<endl;

i++;

}

}

int main()

{

//phaseA

int n;

cout<<"Enter how many records you want to enter:";

cin>>n;

char d;

student s[n];

int i=0;

//reading file

ifstream in("input.txt");//change the file name here

//this will read n records

//assuming in file..records are in below format

//id name currentbalance

while(i<n)

{

//reading from file..

in>>s[i].name;

in>>s[i].id;

in>>s[i].current;

i++;

}

//printing before sorting...

cout<<"\nStudent details before sorting:\n";

display(s,n);

selectionSort(s,n);

cout<<"\nStudent details After sorting:\n";

display(s,n);

int c;

while(1)

{

cout<<"1:Search\n2:Exit\nEnter ur choice:";

cin>>c;

if(c==1)

{

string na;

cout<<"Enter name to search:";

d=getchar();

getline(cin,na);

for(i=0;i<n;i++)

if(s[i].name==na)break;

if(i==n)cout<<"\nNot found\n";

else cout<<"Found at :"<<i<<"\n";

}

else

{

break;

}

}

//phase b

//writing to file

ofstream out("infoout.txt");//opening file...

//writing to file

int k=0;

if(out.is_open())

while(k<n)

{

out<<s[i].id<<" "<<s[i].name<<" "<<s[i].current<<endl;

k++;

}

//closing file

out.close();

return 0;

}

output:

Enter how many records you want to enter:2

Enter name:Waltz Manny

Enter id:a98425

Enter balance:972345

Enter name:Abot Mark

Enter id:b6245

Enter balance:97245

Student details before sorting:

a98425 Waltz Manny 972345

b6245 Abot Mark 97245

Student details After sorting:

b6245 Abot Mark 97245

a98425 Waltz Manny 972345

1:Search

2:Exit

Enter ur choice:1

Enter name to search: