CODEWITHSUNDEEP
carraysfilestore
Kexy Kathe
Kexy Kathe

Reputation: 131

Read numbers from a .txt file and store them in array in C

I've been trying to figure out how to read the scores and storing them in array. been trying for sometime and its clearly not working out for me. Please help.

//ID    scores1 and 2
2000    62  40
3199    92  97
4012    75  65
6547    89  81
1017    95  95//.txtfile


int readresults (FILE* results , int* studID , int* score1 , int* score2);

{
// Local Declarations
int *studID[];
int *score1[];
int *score2[];

// Statements
check = fscanf(results , "%d%d%d",*studID[],score1[],score2[]);
if (check == EOF)
    return 0;
else if (check !=3)
    {
        printf("\aError reading data\n");
        return 0;
    } // if
else
    return 1;

Upvotes: 3

Views: 4857

Answers (2)

Amadan
Amadan

Reputation: 198324

  • You declare variables twice, once in parameter list and once in "local declarations".

  • The function brace is not closed.

  • One fscanf can only read a number of items specified by its format string, in this case 3 ("%d%d%d"). It reads numbers, not arrays. To fill an array, you need a loop (while, or for).

EDIT

Okay, here's one way to do it:

#define MAX 50
#include <stdio.h>

int readresults(FILE *results, int *studID, int *score1, int *score2) {
  int i, items;
  for (i = 0;
      i < MAX && (items = fscanf(results, "%d%d%d", studID + i, score1 + i, score2 + i)) != EOF;
      i++) {
    if (items != 3) {
      fprintf(stderr, "Error reading data\n");
      return -1; // convention: non-0 is error
    }
  }
  return 0; // convention: 0 is okay
}

int main() {
  FILE *f = fopen("a.txt", "r");
  int studID[MAX];
  int score1[MAX];
  int score2[MAX];
  readresults(f, studID, score1, score2);
}

Upvotes: 2

fersarr
fersarr

Reputation: 3529

If you want to call that function just once and have it read the scores for all of the students, you should use something like this:

int i=0;
check = fscanf(results , "%d %d %d",&id[i],&score1[i],&score2[i]);
while(check!=EOF){
        i++;
        check = fscanf(results , "%d %d %d",&id[i],&score1[i],&score2[i]);
    }

Upvotes: 2

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