CS 250 Computer Programming and Problem Solving - FALL 1998 |
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//********************************************
// Read a file of Persons and create a list
// Uses template class
//
// Programmer: Chris Wild
//********************************************
#include "person.h"
#include "tlist.h"
void main()
{
Tlist<Person> myList;
Person someBody;
ifstream aFile("persons.txt");
while(aFile >> someBody) {
myList.InsertAfter(someBody);
}
if(!myList.IsEmpty()) { // loop we saw earlier in Using List Objects
myList.GoTop();
while(myList.Advance()) {
cout << myList.Get();
}
}
}
But how to create a lot of data for testing this progam?
Generating a file by hand is tedious - let's look at generating the data with a program.
#include <stdlib.h> // for srand/rand
#include <time.h> // for time
#include "Person.h"
#include "fixedstring.h"
#include <fstream.h>
// prototypes
FixedString genName();
// returns a fixed string object resembling a name which is generated at random
FixedString genSSN();
// returns a fixed string object resembling a SSN which is generated at random
int genAge();
// returns an age
const int NPersons = 10; // Number of Person records to create
void main()
{
ofstream outFile("persons.txt");
Person someBody;
srand( (unsigned)time( NULL ) );
for(int i=0; i< NPersons;i++) {
someBody.SetFirstName(genName());
someBody.SetLastName(genName());
someBody.SetSSN(genSSN());
someBody.SetAge(genAge());
outFile << someBody; // must be in format that >> can read (made some changes to Person
}
}
// Define random generating functions
FixedString genName()
// returns a fixed string object resembling a name which is generated at random
{
int size = rand()%17 + 3; // randomly pick a size between 3 and 19 characters
char cString[21]; // allocate space for a C-style string
for(int i = 0; i < size; i++) {
cString[i] = char(rand()%26 + int('a'));
}
cString[size] = '\0';
FixedString temp(cString);
return temp;
}
FixedString genSSN()
// returns a fixed string object resembling a SSN which is generated at random
{
int size = 9; // nine digits
char string[10]; // allocate space for a C-style string
for(int i = 0; i < size; i++) {
string[i] = char(rand()%10 + int('0'));
}
string[size] = '\0';
FixedString temp(string);
return temp;
}
int genAge()
// returns an age which increases from 1, 1 at a time
{
static int nextAge = 1;
return nextAge++; // return next number in sequence
//return rand()%100; // or could generate at random up to 100
}