Hello,

I have an assignment where I have to create a hash table and load 30 part numbers into it- should be a 2-d array...and eventually I have to prompt the user to choose an algorithm and keep track of collisions. But I am starting really small with this and want to start with reading a text file into the array. I am close (i think ), but I think I may have put the values into my txt file incorrectly. Can anyone offer advice. I will show my code also
the text file just has the numbers 101-110, 301-310 & 501-510 in a list.

//read part numbers from txt file 'parts.txt'

#include <iostream>
#include <fstream>
using namespace std;

int main()
{
int i;
int array[41];

for(i=0; i<5; i++) //clear array
array[i] = 0;

ifstream in("part.txt", ios::in | ios::binary);
if(!in){
cout << "cannot open file.\n";
return 1;
}

in.read((char *) &array, sizeof array); //read block of data

for(i=0; i<5; i++) //show values read from file
cout << array[i] << " ";

in.close();
return 0;
}

Well for one you declare a array with 41 elements and only seem to need 5. And the lovely thing about fstream is operator overloading so if you want to read in something it's very easy.
Oh and please use Code Tags

Okay so that was my stupid mistake...I actually have 30 values...so I made the array size 41.

but the changes you made worked great, and I will remember the code tags :o I didn't expect a response so helpful...really appreciate it.

Hey I am not always mean .
p.s. Your welcome.

Of course an array is not a hashtable...
There's a hashtable class in the STL, use that.

I know...its just that I am in over my head, and figure if i start simple it might all start to make sense

>There's a hashtable class in the STL, use that.
Not according to the standard, though a hashmap is a common extension.