10-26 Exercise 1: Calculates and displays the GCD of 2 integers

Question

Write a program that asks the user to enter two integers, then calculates and displays their greatest common divisor (GCD).

寫一個輸入兩個整數 輸出它們的最大公因數程式

Hint: Use Euclidean Algorithm

使用歐幾里得演算法

Example input: 

12 28

Example output:

4

 

Answer 1

Hidden content!
 * ** ****    **** **

int  ***
{
int a, b;
* *  * * * ** *    **** **** * * *
 * * *****  **** * *   * *  ** 
{
    *   
***** 
else
** *
}
*** 
**  *  *   *    * * **** 
else
* ** ****** ** **  * 

** ***  0;
}

Comments

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output
Case 4: Correct output

Answer 2

Hidden content!
* **** * **   *  *** 
int main (void)
{
int a,b,c;
**    *    *   ****   * *  * * 
  *  **   * * *   **  *** ** 
while ( a % b != 0){
*  *     ****  *    **** **** *    ***
* **  **   ***   *   *** ***  **  *
    *  *   *  **** * *  * *   *
}
*     * * **  **  **
}

Comments

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output
Case 4: Correct output

Answer 3

Hidden content!
#include <stdio.h>
#include  *  ****  *** *
int a,b;
int i;
int GCD=0;
int remainder, coefficient;
int main()
{
*** ***  * ** **  ******  *** *  ****   *   ** ****  *** * ** *
**   *     **** * ** * *   *   = a % b;
    *  *  **   * *  * ** **  **  (b!=0){
*  ** *  ****  ******  * * *** * ** * *   ******* *** ***  **  
  ** **** **  **    ** *          ***  **  *  **   ** *  ** *

     ***   *  *    *  *      * *  ** * *  * **  * * ** *
* * ***  *  *   ** * *   **  *        * * * **  * ***** ** **

 *** *   **** ** *  *  * *
*   *   **  *    ** *   *    (a==0){GCD=b;}
**  * *** ****    * **  (b==0){GCD=a;}
* * * *  * **  **  ** *** ***     *   ** *  *** 
   ***** *    *  ******   0;
}

Comments

prog.c:6:5: error: built-in function 'remainder' declared as non-function [-Werror]
 int remainder, coefficient;
     ^~~~~~~~~
cc1: all warnings being treated as errors

Answer 4

Hidden content!
#include *    **      *
int main(void)

{
 *  *** *   ***   *  ** *    ** * * a1, a2, i, gcd;


** ** * *  ** *     * ***  ****    **  **  %d", &a1, *******  * 

*  *   * ** *** *    ***  ****  i <= a1 *   * *** *  i <= a2; ++i)
 * ***  *  * ** * *  **
**** **** *   *    *** *  **  **  *    ** *  **** **   * * *  * * ***** * a2%i==0)
* *** ***** **** * ** * **    *    *** ***** * *   ****   **** ** * ** * *** *  ** = i;
**  * * * *         ****  *

 *          * ***** * *   * **    ** ****** *   * gcd);

* * ****** **  ** *** ** * * * *  0;
}

Comments

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output
Case 4: Correct output

Answer 5

Hidden content!
#include<stdio.h>
int main()
{
* *  *  ****** *** *    *   ** * a,b,c;
  **  * ** ********      **    **      %d",&a,&b);
    **   ** ** **   * * *  ***** (a%b!=0)
   ** ** *     ***    * 
***  ** ***  *  *   ** ****  * *  *  * * * *  *   *  * **
****  **  *   * ****   * *      *   *  ******     **** * * 
 ***  **** * ** *    * * *  *** **    *****  *  * ****
  *  * **     *     * *** *** 
 * *   ***   *** **    ** ***    **** **** ***  * * *
* *  ** **   **  **  * * **     0;
}

Comments

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output
Case 4: Correct output

Answer 6

Hidden content!
***   ****** *  *****
int main (void)
{
int a,b,c;
 *  ** * **  * *** ***  **
  *      * **** *****   
while ( a % b != 0){
  ***** ***   *  **  ***** *  **  
* * ** *  **  * * ****    ******** 
* *   **  ****     *   ***** *   
}
*   *  ***  **    * *
}

Comments

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
Case 4: Wrong output

Answer 7

Hidden content!
#include<stdio.h>
int main()
{
    *  ***  *   *   * *  * a,b,c;
  ****    * * ** * * * *  *** ***** * %d",&a,&b);
  ***** ***   *  ***  ** * **   (a%b!=0)
      ** * ** * * *   ** ****
 *  *    ** ** * ***    ****** * ****  *  ******* ****
* *  *  ** ******       * ** * *** *    *  * * **     **  
   **  ***  *  *  *  * * *  ** ***  ***** ** **   **  **   * *  
  **       * **  *********    * 
*****   * ** *     ** *  ******* **  **   * * 
*** *** **   *   *   **  * *  * 0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
Case 4: Wrong output

Answer 8

Hidden content!
#include *  ** *     
int ** *  
{
 * ***   ** ** int a,b;
  ** * *****   * *   * *    *  * **** *     *   *
 *  * *   *  * * 
 ** ***   **  
*  * * *  *  * ** * *** ** 
* * **  *    ** * {
  **       *  *    *  ** * * *  int c=a%b;
  ***** *      * **    ** a=b;
      *** *****     ***    **** b=c;
** *   *  ** *  * *** ** 
 * **   }
  ** * *   * * 
 ***** ** * ***    
return   ******     *  **  
    * *    *** 
****  *** ***** *   
* * * *  ** 
}

Comments

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output
Case 4: Correct output

Answer 9

Hidden content!
#include<stdio.h>

int main() {
*    ** ** ** * * *   *  ***      a, b, tmp;
*   *** * *   **   *   *  * *   *  %d", &a, &b);
  *  *    * ****** ** * *    * **** * * {
 *      ****   ** ****   ** * ***  ***   **  *   * * ***** * 
* ** *  ** ***** *  * *** * ****    *  **  * * *   * **  * 
*    ** *  *** *   * * ** *  * ** *  **** *** *** **    * ** *
  *  * ***   **** **   **  
 * ****   **      **   ** *  *  **    ** b);
}

Comments

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output
Case 4: Correct output

---

great!