Thread: How to read a line of integers?

If i want to read 10 integers from a file i would write this:

Code:

int main(){

    int i;

    freopen("numbers.txt","r",stdin);

    for(i = 0; i <= 10; i++){
        scanf("%d",&i);
        printf("%d",i);
    }
    fclose(stdin);

    return 0;
}

But how to write a loop if i don't know how many integers will be in a file?

Take a look at fread .
It will return NULL when it reads out the file....

Do a "forever loop" (with a break inside to get out)

Code:

for (;;) {
    /* ... */
    if (NEED_TO_EXIT_LOOP) break;
    /* ... */
}

it would be better to use fopen since freopen works mostly when the file had already been opened.

Code:

FILE *fp = fopen("numbers.txt", "rb");

int k = 0;
while(  k < 10)
{
     fscanf(fp, "%d", &i);
      k++;
}