how can I stop the file scanner from reading the ints after the max number

Question

Sorry if it seems pretty simple to solve. But I am really new to C and have tried a lot, but I cant figure out how to stop the scanner from reading more integers than the max limit. I have a file which has 22 integers, but I want the array to store only 20 integers from the file. But still it's reading all integers. Any tip would be really valuable for me :/ Thanks a lot

int *array = malloc(20* sizeof(int));

while(fscanf(fp,"%d",&array[i])!=EOF)
    {

        printf("%d\n",array[i]); 
if(*array <= 20){
        i++;
    }
}

Logan Murphy · Accepted Answer · 2014-09-29T19:43:16.887

The code you have will increment i while the element in the first index of the array is less than or equal to 20. Which is possible if your first number (from the file) is less than or equal to 20.

if(*array <= 20){

You should do the following

while(i < 20) {
    if(fscanf(fp, "%d", &array[i]) != EOF) {
        printf("%d\n",array[i]); 
        i++;
    } else {
        break;
    }
}

Maybe later add some validation to make sure you read 20 numbers

if(i == 20) {
    ...
}

score 0 · Answer 2 · answered Sep 29 '14 at 19:34

0

after your if:

else {
    break;
}

answered Sep 29 '14 at 19:34

Rocky Pulley

22,531
20
68
106

score 0 · Answer 3 · edited May 23 '17 at 12:13

0

see this example simply just change the counter of for loop and you'll get your job done

edited May 23 '17 at 12:13

Community

1
1

answered Sep 29 '14 at 19:39

Vikas

432
5
18

score -1 · Answer 4 · answered Sep 29 '14 at 19:39

-1

Try adding a break statement along with system.out.println statement.

 else 
{
  System.out.println("sorry!you are done");
  break;
  }

Hope this works!

answered Sep 29 '14 at 19:39

rishanth chavali

115
2
5

this is for c not java – Logan Murphy Sep 29 '14 at 19:39

how can I stop the file scanner from reading the ints after the max number

4 Answers4