#include <stdio.h>
 
int main(void)
{
int i, j;
long dec;  /* ให้รับค่าอินพุทแบบ Long Integer - เลขจำนวนเต็มแบบยาว */
int bit[32];  /* จองพื้นที่ในการเก็บข้อมูลเลขฐาน 2 ลงใน Array */
 
    clrscr();  /* เคลียร์หน้าจอ */
    printf("Decimal Number : ");  /* แจ้งผู้ใช้เพื่อเตรียมป้อนค่าเลขฐาน 10 */
    scanf("%ld", &dec);  /* ต้องใช้ ld เพราะ Input มันเป็นแบบ Long Integer */
    i = 0;  /* กำหนดค่าเริ่มต้นของ Array */
    /* ทำตามที่ได้ออกแบบโปรแกรมเอาไว้ ... ยังไงยังงั้นเลย 55555+ */
    do {
        bit[i++] = dec % 2;  /* การหารเอาเศษ เพื่อให้เป็นคำตอบ */
 
        /* การหารทั่วไป แต่ตัวแปร dec ของภาษา C มันเป็น Integer หรือ เลขจำนวนเต็ม */
        /* ดังนั้นมันจึงตัดเศษ (หรือทศนิยม) ทิ้งไปโดยอัตโนมัติ */
        dec = dec / 2;
 
    } while (dec > 0);  /* เงื่อนไขที่ทำจนกระทั่ง dec = 0 ก็ออกจากวังวนเงื่อนไข */
 
    /* การแสดงผลของการแปลงเลขฐาน 10 เป็นเลขฐาน 2*/
    /* j = i - 1 และให้ j ลดค่าลงทีละ 1 ... ก็คืออ่านข้อมูลถอยหลังกลับเท่านั้นเองครับ */
    /* เพราะตัวแปรแบบ Array ในภาษา C มันเก็บข้อมูลจากซ้ายไปขวา */
    /* ทำให้ LSB มันไปอยู่ทางซ้าย ส่วน MSB มันไปอยู่ทางขวา */
    for(j = i - 1; j >= 0; j--)
        printf("%d", bit[j]);
 
printf("\n");
return 0;
<form>
  <div class="mb-3">
    <label for="exampleInputEmail1" class="form-label">Email address</label>
    <input type="email" class="form-control" id="exampleInputEmail1" aria-describedby="emailHelp">
    <div id="emailHelp" class="form-text">We'll never share your email with anyone else.</div>
  </div>
  <div class="mb-3">
    <label for="exampleInputPassword1" class="form-label">Password</label>
    <input type="password" class="form-control" id="exampleInputPassword1">
  </div>
  <div class="mb-3 form-check">
    <input type="checkbox" class="form-check-input" id="exampleCheck1">
    <label class="form-check-label" for="exampleCheck1">Check me out</label>
  </div>
  <button type="submit" class="btn btn-primary">Submit</button>
</form>
}

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<form>
  <div class="mb-3">
    <label for="exampleInputEmail1" class="form-label">Email address</label>
    <input type="email" class="form-control" id="exampleInputEmail1" aria-describedby="emailHelp">
    <div id="emailHelp" class="form-text">We'll never share your email with anyone else.</div>
  </div>
  <div class="mb-3">
    <label for="exampleInputPassword1" class="form-label">Password</label>
    <input type="password" class="form-control" id="exampleInputPassword1">
  </div>
  <div class="mb-3 form-check">
    <input type="checkbox" class="form-check-input" id="exampleCheck1">
    <label class="form-check-label" for="exampleCheck1">Check me out</label>
  </div>
  <button type="submit" class="btn btn-primary">Submit</button>
</form>