help please
Anyone know why this doesn't program doesn't work?
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#include <iostream>
#include <fstream>
#include <string>
using namespace std;
class Student
{
public:
int iD;
string firstName;
string lastName;
int examGrade;
Student(){};
~Student(){};
Student(int iD, string firstName, string lastName, int examGrade);
};
int main()
{
// Variables
Student Info;
int option = 0;
int size;
int count;
Student *records;
fstream instream;
instream.open("Records.txt");
if(instream.fail())
{
cout << "File Output cannot be open. Try agin." << endl;
exit(1);
}
instream >> size;
records = new Student[size];
for(int i=0; i<size;i++)
{
instream >> Info.iD;
instream >> Info.firstName;
instream >> Info.lastName;
instream >> Info.examGrade;
records[i] = Student(Info.iD, Info.firstName, Info.lastName, Info.examGrade);
}
instream.close();
for(int i = 0; i< size; i++)
{
cout <<records[i].iD << " " << records[i].firstName << " " << records[i].lastName << " " << records[i].examGrade << endl;
}
count = size;
while (option!=-1)
{
cout << "Please enter the ID of the student to be deleted. " << endl;
cout << "To exit, please type -1. " << endl;
cin >> option;
for(int i = 0; i <size; i++)
{
// user erase the id that he/she wants
if(option == records[i].iD)
{
records[i].iD = 0;
count--;
}
}
}
fstream outstream;
outstream.open("Output.txt",ios:: out);
if(outstream.fail())
{
cout << "File Output cannot be open. Try agin." << endl;
exit(1);
}
outstream << count <<endl;
Student *temp;
temp = new Student[size];
int c = 0;
for (int i = 0; i < size; i++)
{
if (records[i].iD != 0)
{
temp[c] = records[i];
c++;
}
}
delete [] records;
records = new Student[count];
for (int i = 0; i < count; i++)
{
records[i] = temp[i];
}
delete [] temp;
for(int i = 0; i < count; i++)
{
outstream << records[i].iD << " " << records[i].firstName << " " << records[i].lastName << " " << records[i].examGrade << endl;
}
outstream.close();
return 0;
}
Student::Student(int ID, string first_name, string last_name, int exam_grade)
{
iD = ID;
firstName = first_name;
lastName = last_name;
examGrade = exam_grade;
}
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Last edited on
Please, describe the "doesn't work" with more details.
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