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!