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!