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!