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!