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!