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!