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!