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!