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!