file_example

#include <iostream>
#include <fstream>
#include <cstdlib>
#define FILENAME "input.txt"
#define SIZE 50
using namespace std;

typedef struct
{
    char name[SIZE];
    int age;
    int height;
    char test1[SIZE];
    char test2[SIZE];
    char test3[SIZE];
} Patient;

Patient patient_list[500];

void readUntil(fstream &f,char *buf,char delim,int len)
{
    char tmp;
    do
    {
        tmp = f.get();
        int len_tmp = strlen(buf);
        buf[len_tmp] = tmp;
        buf[len_tmp + 1] = '\0';
    } while ((tmp != delim) && (strlen(buf)<len-1));
    buf[strlen(buf)-1] = '\0';
}

int main()
{
    fstream file;
    file.open(FILENAME);
    if (file.is_open())
    {
        char title[SIZE];
        int num_of_records;
        file >> title;
        file.ignore(225, '\n');
        //cout << title << endl;
        //get number of records
        while (file.get() != ':')
            continue;
        file.get(); //get whitespace
        file >> num_of_records;
        file.ignore(225, '\n');
        //cout << num_of_records << endl;

        for (int i = 0; i < num_of_records; i++)
        {
            char temp[SIZE] = { '\0' };
            readUntil(file, patient_list[i].name, ',', SIZE);
            //cout << patient_list[i].name << endl;
            readUntil(file, temp , ',', SIZE);
            patient_list[i].age = atoi(temp);
            temp[0] = '\0';
            readUntil(file, temp, ',', SIZE);
            patient_list[i].height = atoi(temp);
            readUntil(file, patient_list[i].test1, ',', SIZE);
            readUntil(file, patient_list[i].test2, ',', SIZE);
            readUntil(file, patient_list[i].test3, '\n', SIZE);
        }

        patient_list[0].age++;
        //write to file
        file.seekp(ios::beg);
        file << title << endl;
        file << "Number of records: " << num_of_records << endl;
        for (int i = 0; i < num_of_records; i++)
        {
            file << patient_list[i].name << ",";
            file << patient_list[i].age << ",";
            file << patient_list[i].height << ",";
            file << patient_list[i].test1 << ",";
            file << patient_list[i].test2 << ",";
            file << patient_list[i].test3 << endl;
        }
    }
    file.close();
    //system("pause");
    return 0;
}