Reading integer values from a file in c

Question

I am trying to read data from a file to store his first n elements in an array. The data is an integer sequence:

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, ...

When I check the content of the array, I don't find the correct values, it seems like it is saveing the address(?) of the correct values?

Here is my piece of code:

FILE* ifp;
ifp = fopen ("input.txt", "r");
int n = 10;

int* readbuf;
readbuf = (int *) malloc (n * sizeof(int));

for (int i=0; i<n; i++){
  int j = 0;
  fscanf (ifp, "%d", &j);
  j = readbuf[i];
  printf ("\n j = %d and readbuf = %d", j, readbuf[i]);
}
fclose(ifp);

Would the code be different if the input file contains following sequence:

0
1
2
3
...

To read a line you could use fgets. There is a example too.

Andre Hofmeister
– Andre Hofmeister

2014-03-03 16:47:35 +00:00
Commented Mar 3, 2014 at 16:47 — Andre Hofmeister
– Andre Hofmeister, Commented Mar 3, 2014 at 16:47

Sebastian-Laurenţiu Plesciuc · Accepted Answer · 2014-03-03 16:38:20Z

3

This should fix it :

readbuf[i] = j;

instead of

j = readbuf[i];

answered Mar 3, 2014 at 16:38

Sebastian-Laurenţiu Plesciuc

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2 Comments

Sameed Over a year ago

Wow, thanks! Now I look at it and all I can think is /facepalm

Sebastian-Laurenţiu Plesciuc Over a year ago

Don't let that bring you down. It happens even to the best programmers sometimes.

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