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!