Programming Forums > Application Development > C++

inko9nito · Oct 31st, 2004, 2:33 PM

Ok, we're supposed to read in a bunch of entries from the file (right here) and store each type (item number, description, quantity, and price) in 4 parallel arrays. The problem is that the descrition consists of up to 4 words. So how would you read in the 1 descrition so that it's stored in one array location, another description so that it's in the second array location etc.

This is what I have so far but it reads each word separately and stores in a separate array location.

(Toggle Plain Text)

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

const int SIZE = 26;

int main()
{
	ifstream readFile;
	// open the file
	readFile.open("Invent.dat");

	int count = 0;
	string itemNum[SIZE], itemDsrn[SIZE], itemQuant[SIZE], itemPrice[SIZE];

	while(count < SIZE && !readFile.eof())
	{
 readFile >> itemNum[count];
 
 readFile >> itemDsrn[count]; 
 readFile >> itemQuant[count]; 
 readFile >> itemPrice[count];

 cout << itemNum[count] << " " << itemDsrn[count] << " " << itemQuant[count] 
  << " " << itemPrice[count] << endl;
 count++;
	}
	
	readFile.close();

	return 0;
}

The thing is, our teacher didn't teach us any of this crap.
This is due Tuesday and this is not even 1/3rd of the program (there's more to it than just reading the data from the file).

tempest · Oct 31st, 2004, 3:31 PM

(Toggle Plain Text)

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

const int SIZE = 26;

int main()
{
ifstream readFile;
readFile.open("Invent.dat");

char itemNum[SIZE][128], itemDsrn[SIZE][128];
int itemQuant[SIZE], itemPrice[SIZE], count = 0, pos = 0;

for(int i=0;i<SIZE * 4;i++) {
  if(readFile.eof()) break;

  if(count == 4) {
    count = 0;
    pos++;
  }

  switch(count) {
    case 0:
      readFile.getline(itemNum[pos], 128, '\t');
      break;
    case 1:
      readFile.getline(itemDsrn[pos], 128, '\t');
      break;
    case 2:
      readFile >> itemQuant[pos];
      break;
    case 3:
      readFile >> itemPrice[pos];
      break;
  }

  count++;
}

readFile.close();

return 0;
}

Cheers.

inko9nito · Oct 31st, 2004, 3:46 PM

Hmm, I'm getting weird output. Why did you use 128? Why did you make itemNum a character array? Please don't get me wrong, I'm not complaining, I'm just curious and confused.

Output I'm getting:
-858993460
-858993460216
216
-858993460
-85899346086
86
-858993460
-858993460106
106
-858993460
-858993460130
130
-858993460
-85899346095
95
-858993460
-858993460435
435
-858993460
-858993460

tempest · Oct 31st, 2004, 3:59 PM

My fault for not testing it, i made itemNum a character array on the assumption you wouldnt need to do any mathmatical operations with it. That however can be changed easily.

(Toggle Plain Text)

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

const int SIZE = 26;

int main()
{
ifstream readFile;
readFile.open("Invent.dat");

item itemNum[SIZE];
char itemDsrn[SIZE][128];
int itemQuant[SIZE], itemPrice[SIZE], count = 0, pos = 0;

for(int i=0;i<(SIZE * 4);i++) {
  if(readFile.eof()) break;

  if(count == 4) {
    count = 0;
    pos++;
  }

  switch(count) {
    case 0:
      readFile >> itemNum[pos];
      break;
    case 1:
      readFile.getline(itemDsrn[pos], 128, '\t');
      break;
    case 2:
      readFile >> itemQuant[pos];
      break;
    case 3:
      readFile >> itemPrice[pos];
      break;
  }

  count++;
}

readFile.close();

return 0;
}

To the best of my knowledge that should work, i dont have a C++ compiler to test it with right now so i'll have to wait till tomorrow to try and run it. Sorry, maybe someone with a C++ compiler can help you debug it :blink: :wacko: :ph34r:

B) -- Sorry, i like smilies.

inko9nito · Nov 1st, 2004, 11:31 AM

(Toggle Plain Text)

cout << itemNum[0] << itemNum[1] << itemNum[2];

I tried to output first 3 array positinos of itemNum and this is what I got

-858993460-858993460-858993460

Oct 31st, 2004, 2:33 PM	#1
inko9nito Newbie Join Date: Oct 2004 Location: Wylie, TX Posts: 11 Rep Power: 0	Ok, we're supposed to read in a bunch of entries from the file (right here) and store each type (item number, description, quantity, and price) in 4 parallel arrays. The problem is that the descrition consists of up to 4 words. So how would you read in the 1 descrition so that it's stored in one array location, another description so that it's in the second array location etc. This is what I have so far but it reads each word separately and stores in a separate array location. (Toggle Plain Text) #include <iostream> #include <fstream> #include <string> #include <iomanip> using namespace std; const int SIZE = 26; int main() { ifstream readFile; // open the file readFile.open("Invent.dat"); int count = 0; string itemNum[SIZE], itemDsrn[SIZE], itemQuant[SIZE], itemPrice[SIZE]; while(count < SIZE && !readFile.eof()) { readFile >> itemNum[count]; readFile >> itemDsrn[count]; readFile >> itemQuant[count]; readFile >> itemPrice[count]; cout << itemNum[count] << " " << itemDsrn[count] << " " << itemQuant[count] << " " << itemPrice[count] << endl; count++; } readFile.close(); return 0; } #include <iostream> #include <fstream> #include <string> #include <iomanip> using namespace std; const int SIZE = 26; int main() { ifstream readFile; // open the file readFile.open("Invent.dat"); int count = 0; string itemNum[SIZE], itemDsrn[SIZE], itemQuant[SIZE], itemPrice[SIZE]; while(count < SIZE && !readFile.eof()) { readFile >> itemNum[count]; readFile >> itemDsrn[count]; readFile >> itemQuant[count]; readFile >> itemPrice[count]; cout << itemNum[count] << " " << itemDsrn[count] << " " << itemQuant[count] << " " << itemPrice[count] << endl; count++; } readFile.close(); return 0; } The thing is, our teacher didn't teach us any of this crap. This is due Tuesday and this is not even 1/3rd of the program (there's more to it than just reading the data from the file). __________________ Страшнее человека-паука только человек-тапок.

Oct 31st, 2004, 3:31 PM	#2
tempest Programming Guru Join Date: Oct 2004 Posts: 1,041 Rep Power: 6	(Toggle Plain Text) #include <iostream> #include <fstream> #include <string> #include <iomanip> using namespace std; const int SIZE = 26; int main() { ifstream readFile; readFile.open("Invent.dat"); char itemNum[SIZE][128], itemDsrn[SIZE][128]; int itemQuant[SIZE], itemPrice[SIZE], count = 0, pos = 0; for(int i=0;i<SIZE * 4;i++) { if(readFile.eof()) break; if(count == 4) { count = 0; pos++; } switch(count) { case 0: readFile.getline(itemNum[pos], 128, '\t'); break; case 1: readFile.getline(itemDsrn[pos], 128, '\t'); break; case 2: readFile >> itemQuant[pos]; break; case 3: readFile >> itemPrice[pos]; break; } count++; } readFile.close(); return 0; } #include <iostream> #include <fstream> #include <string> #include <iomanip> using namespace std; const int SIZE = 26; int main() { ifstream readFile; readFile.open("Invent.dat"); char itemNum[SIZE][128], itemDsrn[SIZE][128]; int itemQuant[SIZE], itemPrice[SIZE], count = 0, pos = 0; for(int i=0;i<SIZE * 4;i++) { if(readFile.eof()) break; if(count == 4) { count = 0; pos++; } switch(count) { case 0: readFile.getline(itemNum[pos], 128, '\t'); break; case 1: readFile.getline(itemDsrn[pos], 128, '\t'); break; case 2: readFile >> itemQuant[pos]; break; case 3: readFile >> itemPrice[pos]; break; } count++; } readFile.close(); return 0; } Cheers. __________________

Oct 31st, 2004, 3:46 PM	#3
inko9nito Newbie Join Date: Oct 2004 Location: Wylie, TX Posts: 11 Rep Power: 0	Hmm, I'm getting weird output. Why did you use 128? Why did you make itemNum a character array? Please don't get me wrong, I'm not complaining, I'm just curious and confused. Output I'm getting: -858993460 -858993460216 216 -858993460 -85899346086 86 -858993460 -858993460106 106 -858993460 -858993460130 130 -858993460 -85899346095 95 -858993460 -858993460435 435 -858993460 -858993460 __________________ Страшнее человека-паука только человек-тапок.

Oct 31st, 2004, 3:59 PM	#4
tempest Programming Guru Join Date: Oct 2004 Posts: 1,041 Rep Power: 6	My fault for not testing it, i made itemNum a character array on the assumption you wouldnt need to do any mathmatical operations with it. That however can be changed easily. (Toggle Plain Text) include <iostream> #include <fstream> using namespace std; const int SIZE = 26; int main() { ifstream readFile; readFile.open("Invent.dat"); item itemNum[SIZE]; char itemDsrn[SIZE][128]; int itemQuant[SIZE], itemPrice[SIZE], count = 0, pos = 0; for(int i=0;i<(SIZE * 4);i++) { if(readFile.eof()) break; if(count == 4) { count = 0; pos++; } switch(count) { case 0: readFile >> itemNum[pos]; break; case 1: readFile.getline(itemDsrn[pos], 128, '\t'); break; case 2: readFile >> itemQuant[pos]; break; case 3: readFile >> itemPrice[pos]; break; } count++; } readFile.close(); return 0; } include <iostream> #include <fstream> using namespace std; const int SIZE = 26; int main() { ifstream readFile; readFile.open("Invent.dat"); item itemNum[SIZE]; char itemDsrn[SIZE][128]; int itemQuant[SIZE], itemPrice[SIZE], count = 0, pos = 0; for(int i=0;i<(SIZE * 4);i++) { if(readFile.eof()) break; if(count == 4) { count = 0; pos++; } switch(count) { case 0: readFile >> itemNum[pos]; break; case 1: readFile.getline(itemDsrn[pos], 128, '\t'); break; case 2: readFile >> itemQuant[pos]; break; case 3: readFile >> itemPrice[pos]; break; } count++; } readFile.close(); return 0; } To the best of my knowledge that should work, i dont have a C++ compiler to test it with right now so i'll have to wait till tomorrow to try and run it. Sorry, maybe someone with a C++ compiler can help you debug it :blink: :wacko: :ph34r: B) -- Sorry, i like smilies. __________________

Nov 1st, 2004, 11:31 AM	#5
inko9nito Newbie Join Date: Oct 2004 Location: Wylie, TX Posts: 11 Rep Power: 0	(Toggle Plain Text) cout << itemNum[0] << itemNum[1] << itemNum[2]; cout << itemNum[0] << itemNum[1] << itemNum[2]; I tried to output first 3 array positinos of itemNum and this is what I got -858993460-858993460-858993460 __________________ Страшнее человека-паука только человек-тапок.

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Programming Forums > Application Development > C++

Reading Data From File In C++