Original Post
Hi, how would i read data from a text file where values are separated by a comma ?
For example: 1,2,3,4,5,6 ...
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C++ : reading input from file
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Well, I would write this:
#include <stdio.h>
FILE* fp = fopen(filename,"r+t");
char list[10][5];
bool item_finish;
int ch,x,y;
for (x = 0; x < 10; x++)
{
item_finish = true;
for (y = 0; y < 5; y++)
{
ch = fgetc(fp);
if (ch == '','') item_finish = true;
if (item_finish == false) list[x][y] = ch;
}
}
If you want to make a function out of it, you''ll need to put the variable ''list'' into shared memory or a global variable.
Also, if you want to convert a string with a number in it (i.e. "2537") to an int (i.e. 2537), call the function:
int atoi(char*)
#include <stdio.h>
FILE* fp = fopen(filename,"r+t");
char list[10][5];
bool item_finish;
int ch,x,y;
for (x = 0; x < 10; x++)
{
item_finish = true;
for (y = 0; y < 5; y++)
{
ch = fgetc(fp);
if (ch == '','') item_finish = true;
if (item_finish == false) list[x][y] = ch;
}
}
If you want to make a function out of it, you''ll need to put the variable ''list'' into shared memory or a global variable.
Also, if you want to convert a string with a number in it (i.e. "2537") to an int (i.e. 2537), call the function:
int atoi(char*)
Thx for helping: i tried Fuzziqer_Software example, but the array filled is empty, probably there is a bug somewhere in the routine ...
Here's yet an alternative
[edited by - civguy on April 23, 2003 7:09:43 PM]
#include <iostream>
#include <fstream>
#include <algorithm>
#include <string>
int main() {
std::ifstream fin("pikkustedi.cpp");
while(fin) {
std::string text;
std::getline(fin, text, ',');
std::cout << text << '\n';
}
}
[edited by - civguy on April 23, 2003 7:09:43 PM]
ok, but how would i store data into an array ? I want for example smt like
listed[10][0]=1
listed[10][1]=2
listed[10][2]=3
listed[10][3]=4
listed[10][0]=1
listed[10][1]=2
listed[10][2]=3
listed[10][3]=4
why did civguy #include <algorithm>? Am I missing something here?
And penetrator, just use AP''s code slightly modified, it was the best (IMHO) C++ solution here.
good luck! .sen
And penetrator, just use AP''s code slightly modified, it was the best (IMHO) C++ solution here.
#include <iostream>
#include <fstream>
using namespace std;
const int MAX_ARRARY_SIZE = 10;
void main()
{
int array[MAX_ARRAY_SIZE];
ifstream fin( "foo.txt" ); // fin > in
for(int i=0; fin && i<MAX_ARRAY_SIZE; i++)
{
fin >> array[i];
fin.ignore(INT_MAX, '','');
}
}
good luck! .sen
be more specific, I don''t understand your question. .sen
quote:I remembered std::getline was there, but apparently it was in <string>.
Original post by Senses777
why did civguy #include <algorithm>? Am I missing something here?
quote:Use the code I posted, it reads spaces too.
I want to do that but read spaces also, but it just skips them what can I do?
quote:You ought to read some introductory material if you don''t know how to store values into an array from the code I posted. Giving you a direct answer here wouldn''t get you far.
Original post by penetrator
ok, but how would i store data into an array ? I want for example smt like
listed[10][0]=1
listed[10][1]=2
listed[10][2]=3
listed[10][3]=4
quote:
Original post by civguy
You ought to read some introductory material if you don''t know how to store values into an array from the code I posted. Giving you a direct answer here wouldn''t get you far.
good point. But I respond to everything that I read once the clock hits 3AM here. It''s almost like I''m spilling out dreams about programming, I can''t help but reply to any question that I know remotely anything about and leave messages that are way too long. Wait... I see where this is going...
Sleep well. .sen
i apologize for answering before reading better what you guys wrote. The code from Senses777 it''s ok. I''m currently trying to learn C++ and i found it quite complicated, and my english is not so good so often i don''t understand very well. Excuse me and thanks again to everybody !
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