Is Prime between two numbers

#include <stdio.h>

int primesInInterval() {
  int low, high, i, flag;
  printf("Enter two numbers(intervals): ");
  scanf("%d %d", &low, &high);
  printf("Prime numbers between %d and %d are: ", low, high);
  // iteration until low is not equal to high
  while (low < high) {
    flag = 0;
    // ignore numbers less than 2
    if (low <= 1) {
      ++low;
      continue;
    }
    // if low is a non-prime number, flag will be 1
    for (i = 2; i <= low / 2; ++i) {
      if (low % i == 0) {
        flag = 1;
        break;
      }
    }
    if (flag == 0)
      printf("%d ", low);
    // to check prime for the next number
    // increase low by 1
    ++low;
  }
  return 0;
}