Reading from file into array and performing operations with numbers in the array

Question

Hi i need to read numbers from file and make a new file with only repeated numbers included.
I run into problem that when i read into array those numbers are not seperated.

So I want to ask how to read numbers from files with spaces or how to know when number ends?

Because if I read like this i can't do any more operations with those numbers.

#include<stdio.h>
#include<stdlib.h>
#include<string.h>

int main()
{
  FILE *file = fopen("w.txt", "r");
  int integers[100];

  int i = 0;
  int num;
  while (fscanf(file, "%d", &num) > 0)
  {
    integers[i] = num;
    i++;
    printf("%d", integers[i]);
  }
  fclose(file);
  system("pause");
  return 0;
}

I want to ask how to read a question written without any punctuation ... — alk
– alk, Commented Feb 15, 2014 at 16:09
In regards to this question you recently asked: you are supposed to accept the best answer on Stack Overflow, not the quickest: "Don't pick too quickly: Try not to select an answer minutes after posting it. Sometimes a better answer will come hours later, and you might miss out on it if you select your answer too fast. The other problem with this is that other stack overflow users will see the accepted answer, only read that one and not the others, and vote it up. You will have an inflated vote answer for possibly not the best answer." — Amal
– Amal, Commented Apr 26, 2014 at 10:37

alk · Accepted Answer · 2014-02-15 16:59:15Z

0

I'd increase the index counter after having tried to print the number just read in:

while(fscanf(file, "%d", &num) > 0) {
  integers[i] = num;
  printf("%d\n", integers[i]); /* Printing a \n after each number puts it on a new line. */
  i++;

edited Feb 15, 2014 at 16:59

answered Feb 15, 2014 at 16:10

alk

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5 Comments

user3313750 Over a year ago

It's still doesnt matter imagine .txt file content is 10 99 i read it into array as 1 0 9 9 i need it to be 10 99 but dont know how

alk Over a year ago

@user3313750: The code you show reads 12 34 as 12 and 34. The case you describe in your comment in cannot reproduce. Also please see my updated answer.

user3313750 Over a year ago

Yh little bit retarded just came from work sry ty by the way but still why #include<stdio.h> #include<stdio.h> #include<stdlib.h> #include<string.h> int main() { FILE *file = fopen("w.txt", "r"); int integers[100]; int i = 0,a,b; int num; while(fscanf(file, "%d", &num) > 0) { integers[i] = num; i++; } fclose(file); for (a=0;a<100;a++) { for(b=0;b<100;b++) { if(integers[a]==integers[b]); printf("%d",integers[a]); }} system("pause"); return 0; } ` this brings mass nonsence ?

alk Over a year ago

@user3313750: What is this if(integers[a]==integers[b]); for? Please note the ; at the end!

user3313750 Over a year ago

to compare if 1 element is equal to other element btw always forget those :)

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