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!