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!