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!