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#include "stdafx.h"
#include<iostream.h> //include input/output library
#include<string.h> //include string library
#include<fstream.h> //include file stream which allows to create files
# define MAX 100 // Variable MAX=100
struct person //create structure
{
char name[30];
char street[40];
char town[20];
char postcode[10];
}info[MAX];
//Function Load
void load()
{
ifstream records_file("RECORDS.DAT");
int i; //declare variable int i
for(i=0; i<MAX; i++);
while (!records_file.eof())
{
records_file.read ((char *) info, sizeof(info));
cout<<'\n';
};
}
//Function find_free which finds a free record
find_free()
{
register int i; //declare variable int i
for(i=0; i<MAX; i++) //initialise i
if(!*info[i].name) return i;
return -1;
}
//Function save which saves a record
void save()
{
ofstream records_file("RECORDS.DAT",ios::out|ios::app);; //open file from disk and point to end of file to avoid overwriting
if (!records_file){ //display error msg if file not found
cout << "Cannot Open File" << endl;
};
printf("\nsaving file\n");
records_file.write ((char *) info,sizeof(info)); //write to file 'RECORDS.DAT' by filling the fields of the 'info'
records_file.close(); //close file
}
//Function 'inputs'
void inputs( char *prompt , char *s , int count)
{
char str[255];
do {
printf(prompt); //Displays msg on screen like "Enter Name"
gets(str);
if(strlen(str)>=count) printf("\nToo Long! Enter Again\n"); //When the string size exceeds its limit it gives error msg
} while(strlen(str)>=count);
strcpy(s , str); //this copy's the entered data to the appropiate string of the structure
}
//Function Enter which allows user to input record(s)
void enter()
{
int i;
for(;;) {
i = find_free(); // calls function 'find_free' and finds a free structure
if(i<0) { //if i is a negative number, give error
cout<<"Error\n";
return;
}
else if (i>MAX) { //if i is greater than 100, give message 'List Full'
cout<<"List full\n";
return;
}
//call function 'input'
inputs("Enter Name: ", info[i].name,30); if(!*info[i].name) break; //if nothing is entered stop executing the function
inputs("Enter Street: ", info[i].street, 40);
inputs("Enter Town: ", info[i].town, 20);
inputs("Enter Postal Code: ", info[i].postcode, 10);
save();
}
}
//Function find which finds a specific record
find(char *name)
{
int i;
for(i=0 ; i<MAX ; i++) //initialise i
if(!strcmp(name ,info[i].name)) break; //if the name entered by the user is not the same as any in the list, end function
if(i==MAX) return -1;
else return i;
}
//Function Del which deletes a record
void del()
{
load();
int i; //declare i
char str[255]; //declare str with size limit of 255
inputs("enter name: " , str , 30); //user is asked to enter the name which has to be deleted
i = find(str); //call function 'find'
if (i>=0) *info[i].name = '\0' ;
else printf("not found\n") ;
}
//Function display
void display(int i)
{
printf("%s\n" , info[i].name);
printf("%s\n" , info[i].street);
printf("%s\n" , info[i].town);
printf("%s\n" , info[i].postcode);
}
//Function display_records which displays all records
void display_records()
{
load(); //call function 'load' to open the RECORDS.DAT file from HDD
printf("\n");
int i;
for(i=0 ; i<MAX ; i++) {
if(*info[i].name) //if records exists
display(i); //call function display which shows the full list of records
printf("\n\n");
}
printf("\n\n");
}
//Function Search
void search()
{
load(); //call function 'load' to open the RECORDS.DAT file from HDD
int i;
char name[30];
printf("\n");
inputs("Enter Name to Find: " , name , 30); //call function inputs which allows user input. User is aked to enter the key field(name) to find record
printf("\n");
if ((i=find(name))<0) //if the name entered does not exist in the record, display msg 'Not Found'
printf("Not found\n");
else display(i); //if the name entered is found, display the record.
}
//Main Function
void main(void)
{
register int i; //initialise i
for (i=0;i<MAX;i++)
*info[i].name='\0';
//ofstream records_file("RECORDS.DAT"); //create file RECORDS.DAT
//menu
int choice;
cout<<"Welcome. What would you like to do?"<<'\n';
cout<<"Create a new record - (Press '1')"<<'\n';
cout<<"Delete a record - (Press '2')"<<'\n';
cout<<"Display all records - (Press '3')"<<'\n';
cout<<"Find a record - (Press '4')"<<'\n';
cout<<"Quit - (Press '0')"<<'\n';
cin>>choice; //user inputs his/her choice
switch(choice)
{
case 1:
enter(); //calling function 'enter' which allows user to input a record
main();
break;
case 2:
del(); //delete a record
main();
break;
case 3:
display_records();
main();
break;
case 4:
search();
main();
break;
}
}
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