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!