How can I successfully make my program work

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C++

You are working in a university, and the head of the department assigned to you the task of writing a C++ program that allows students to enroll in courses. The program should also update courses information after each enrollment, and issue the course table to the student. The student can enroll in maximum two courses. The program ends if the student entered the letter f or after enrolling in two courses. Assume that three courses are opened and their information.

when i open the program and input the course name and id nothing happen i also couldn't update the courses.

What I have tried:

#include<iostream>
#include<fstream>
#include<string>
#include<iomanip>
using namespace std;
int main()
{
    string course_name,u_course_name,a,b,c,d;
    int u_courseID,courseID,maxnbr,nbenrolled,count,i;
    char y;
    count=0;
    i=0;
    ifstream infile;
    infile.open("courses.txt");
    if(!infile)
    {
        cout<<"error"<<endl;
        return 0;
    }
    infile>>courseID>>course_name>>maxnbr>>nbenrolled;
    infile>>courseID>>course_name>>maxnbr>>nbenrolled;
    for  (i=0;infile,i<3;i++)
    {
        cout<<"please enter your choice in the form ( courseID , coursename )"<<endl;
        cin>>y>>u_courseID>>y>>u_course_name>>y;
        infile>>courseID>>course_name>>maxnbr>>nbenrolled;
        while(count<2)
        {
            if((u_courseID=='f') || (y=='f') || (u_course_name =="f"))
            {
                cout<<"Program is terminating....";
                return 0;
            }
            else if((courseID==u_courseID) && (course_name==u_course_name) && (nbenrolled<maxnbr))
            {
                cout<<"you are enrolled in the following course"<<endl<<setw(18)<<"**********"<<endl<<
"courseID : "<<courseID<<setw(25)<<"course name : "<<course_name<<endl;
                nbenrolled++;
                count++;
            }
            else if((courseID==u_courseID) && (course_name==u_course_name) && (maxnbr==nbenrolled))
            {
                cout<<"this course is full"<<endl;
            }
            i++;
        }
    }
    return 0;
}