用printf（）直接输出20以内的素数

#include <stdio.h>

int main() {
  int n, i = 3, count, c;

  printf("Enter the number of prime numbers to print\n");
  scanf("%d", &n);

  if (n >= 1) {
    printf("First %d prime numbers are:\n", n);
    printf("2\n");
  }

  for (count = 2; count <= n;) {
    for (c = 2; c <= i - 1; c++) {
      if (i % c == 0)
        break;
    }
    if (c == i) {
      printf("%d\n", i);
      count++;
    }
    i++;
  }

  return 0;
}