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!