how to read random number of int in array

Question

i want to read space separated integer into an array and when i press enter it should stop reading at any point of time, how to implement loop for this prog

Answer 1

scanf("%d"... first begins by consuming leading white space. To detect '\n', code should scan leading white-space before calling scanf("%d"....

To terminate input when a '\n' occurs, first begin looking for it. Suggest using getchar().

The following code handles OP goals and:
* Lines beginning with \n
* Lines with more than N int
* EOF and non-numeric input

#include
#include
#define N (30)

int main(void) {
  int arr[N];
  int j = 0;
  for (j = 0; j < N; j++) {  // Don't read too many
    int ch;
    while ((ch = getchar()) != '\n' && isspace(ch));
    if (ch == '\n') {
      break;
    }
    // put back ch
    ungetc(ch, stdin);

    int cnt = scanf("%d", &arr[j]);
    if (cnt != 1) {
      break;  // Stop if input is EOF or non-numeric
    }
  }
  printf("%d\n", j);
  return 0;
}