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!