computer engineering

Question

Write a function to output patient information that are stored in a file. One of the parameters of the function must be no. of patients to output and another one the name of the file where the patients’ information is stored

and Write a function to input patient information and store it in a file. One of the parameters of the function must be no. of patients to input and another one the name of the file to store the information.

Answer 1

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#define PATIENT_STR_LENGTH (12)

typedef struct _TPatient

{

char socialSecurityNum[PATIENT_STR_LENGTH];

char dob[PATIENT_STR_LENGTH];

int status;

} * TPatient;

#define PATIENT_SIZE (sizeof(struct _TPatient))

typedef struct _TPatientDB

{

TPatient patients;

int count;

} * TPatientDB;

int Patient_Input(TPatient patient)

{

printf(" Please input the patient social security # :>");

scanf("%s",patient->socialSecurityNum);

printf("Please input the date of birth :>");

scanf("%s",patient->dob);

int iStatus=-1;

while (iStatus<0)

{

printf(" Please input the patient status :>");

scanf("%d",&iStatus);

}

patient->status = iStatus;

}

void Patient_Output(TPatient patient, char * strMsg)

{

if (strMsg!=NULL)

{

printf("---------------------------------------------------\n");

printf(strMsg);

printf("\n");

}

printf("--------------------------------------------\n");

printf(" soc sec # >%s< \n",patient->socialSecurityNum);

printf(" dob >%s< \n ", patient->dob);

printf(" status = %d \n",patient->status);

}

void Patient_Parse(TPatient patient, char * patientRecBuffCSV)

{

strcpy(patient->socialSecurityNum,strtok(patientRecBuffCSV,","));

strcpy(patient->dob,strtok(NULL,","));

patient->status = atoi(strtok(NULL,","));

}

void Patient_Read(char * filename, int n, TPatientDB patientDB)

{

FILE * fptr = fopen(filename,"r");

char inbuff[255];

int numPatients;

struct _TPatient curPatientRec;

char strMsg[25];

if (fptr!=NULL)

{

//reads the # of patient records from the file and eats the newline

fscanf(fptr,"%d",&patientDB->count); fgets(inbuff,255,fptr);

numPatients = patientDB->count;

patientDB->patients = (TPatient)malloc(PATIENT_SIZE*numPatients);

for (int iLoop=0; iLoop<numPatients; iLoop++)

{

fgets(inbuff,255,fptr);

Patient_Parse(&curPatientRec,inbuff);

memcpy(&patientDB->patients[iLoop],&curPatientRec,PATIENT_SIZE);

if (iLoop<n)

{

sprintf(strMsg,"PATIENT REC # %d of %d \n",(iLoop+1),numPatients);

Patient_Output(&patientDB->patients[iLoop],strMsg);

}

}

fclose(fptr);

}

else

{

patientDB->count=-1;

patientDB->patients = NULL;

}

}

void Patient_SerializeToCSV(TPatient patient,char * patientRecBuffCSV)

{

sprintf(patientRecBuffCSV,"%s,%s,%d",patient->socialSecurityNum,patient->dob,patient->status);

}

void Patient_Write(char * filename, int n, TPatientDB patientDB)

{

FILE * fptr;

fptr = fopen(filename,"w");

char outbuff[255];

int iLoop;

fprintf(fptr,"%d\n",patientDB->count);

for (int iLoop=0; iLoop<patientDB->count; iLoop++)

{

Patient_SerializeToCSV(&patientDB->patients[iLoop],outbuff);

fprintf(fptr,"%s\n",outbuff);

}

fclose(fptr);

}

PatientDB_Destroy(TPatientDB patientDB)

{

if (patientDB->patients!=NULL)

{

free(patientDB->patients);

}

patientDB->count=0;

}

PatientDB_Input (TPatientDB patientDB)

{

int n=-1;

int iLoop;

char filename[255];

while (n<0)

{

printf(" How many patients ??? :>");

scanf("%d",&n);

}

patientDB->count=n;

patientDB->patients = (TPatient)malloc(PATIENT_SIZE*n);

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

{

Patient_Input(&patientDB->patients[iLoop]);

}

printf("Filename :>"); scanf("%s",filename);

Patient_Write(filename,n,patientDB);

}

int main()

{

struct _TPatientDB patientDB;

struct _TPatientDB dbPatients;

Patient_Read((char*)"E:\\patients.dat",4,&patientDB);

PatientDB_Input(&dbPatients);

PatientDB_Destroy(&patientDB);

PatientDB_Destroy(&dbPatients);

}