10-19 Exercise 2: Convert decimal to binary number

Question

Write a program to convert a decimal number (<256) to binary. Use +-*/% operations only. Loops are not permitted

寫一個把十進位轉換成二進位數的程式。請使用 +-*/% 運算子，不允許使用迴圈。

Example input:

50

Example output:

110010

 

Answer 1

Hidden content!
#include<stdio.h>
int main()
{
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    }
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}

Comments

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output

---

-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output

---

-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output

---

-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output

Answer 2

Hidden content!
#include<stdio.h>
int main()
{
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    }
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}

Comments

prog.c: In function 'main':
prog.c:4:21: error: unused variable 'result' [-Werror=unused-variable]
     int a,b,c=1,d=0,result;
                     ^~~~~~
cc1: all warnings being treated as errors

Answer 3

Hidden content!
#include <stdio.h>
int main()
{
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* **    *   *** ****** ***  **  0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output

Answer 4

Hidden content!
#include <stdio.h>
#include <stdlib.h>

int main()
{
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    {   b=a%2;
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}

Comments

prog.c: In function 'main':
prog.c:17:12: error: too many arguments for format [-Werror=format-extra-args]
     printf("%d%d%d%d%d%d",h,g,f,e,d,c,b);
            ^~~~~~~~~~~~~~
cc1: all warnings being treated as errors

Answer 5

Hidden content!
#include <stdio.h>
#include <stdlib.h>
int dec_num=0;
int bin_digit[8]={0,0,0,0,0,0,0,0};
int bin_num=0;
int main()
{
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*  * *    **     *  **** *** = dec_num/2;

* * * *  ** * * *     *** **   *   *  = dec_num%2;
*  * * **   * *****    **   **   = dec_num/2;

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***  *   ** *     **  * ***  = dec_num/2;

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}

Comments

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output

---

-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output

---

-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output

---

-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output

Answer 6

Hidden content!
#include <stdio.h>
#include <stdlib.h>
short dec_num=0;
int * *    *  *   * *  ** * 
int bin_num=0;
int main()
{
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**   ***    ***** **** **** *  * ** = dec_num%2;
**** **       *  * **  * *** * = dec_num/2;

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* * ****    ***  * **        **** = dec_num/2;

**   *    *  *  * ***    **  *  ***  * = dec_num%2;
*** *  *   * *   *      ***    *  = dec_num/2;

    *  *    ***  * ***   ** *  * *    = dec_num%2;
    *** ** *** **   **    * * ***  = dec_num/2;

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*     *   ** *   *   **** * = dec_num/2;

*** *  **  *   * *** **  *       *** = dec_num%2;
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}

Comments

prog.c: In function 'main':
prog.c:8:13: error: format '%d' expects argument of type 'int *', but argument 2 has type 'short int *' [-Werror=format=]
     scanf("%d",&dec_num);
             ^
cc1: all warnings being treated as errors

Answer 7

Hidden content!
#include <stdio.h>
#include <stdlib.h>

int main()
{
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** ****    *  *** ************ **  * * * ***** **   * **  ** 
*  *** * *    ****  *  *  (a>0&&a<256)
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***  *     **** *  **** *** *** * **** *  0;}
  *** **  **    *** * ***   * * *  *  ** **     *  ***  * ***   **** **
*      ****   * *  *  * **  0;
}

Comments

Case 0: Correct output
Case 1: Correct output
Case 2: Wrong output
Case 3: Wrong output

Answer 8

Hidden content!
#include <stdio.h>
#include <stdlib.h>

int main()
{
* *     * **    **    ****   *  a,b,c,d,e,f,g;
* **** *** *  *  ***      * *   * * *    *  *    *****
     ****  *  **   * (a<256)
    {   b=a%2;
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*  ** **  **   *    **   **    * *    **   * **   * ***    **
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****  *     * **    * *    **********  0;}
 * ***** ** * *  *  ** **     * * *      *   *  *    * *
* ** *      * * *   * ** *  *   *  0;
}

Comments

Case 0: Correct output
Case 1: Correct output
Case 2: Wrong output
Case 3: Wrong output

Answer 9

Hidden content!
#include <stdio.h>
#include <stdlib.h>

int main()
{
*  **    * * * *   *  **     * a,b,c,d,e,f,g;
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    if (a<256)
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*   ***  *   *  ***  **  *  * *   *** *   * * * * * *   **
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* * * *** ***  * **     ***         **** * **  *     * ***     *
* * *  * * ** *    * *  * * *** *   *****    **  *    ** *   ** **
*   *  * *  *  *** *  ****  **   **** * *  **  * ** *****  * 
*    ***** *     *     **  0;
}

Comments

prog.c: In function 'main':
prog.c:8:5: error: this 'if' clause does not guard... [-Werror=misleading-indentation]
     if (a<256)
     ^~
prog.c:10:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
         c=(a/2)%2;
         ^
cc1: all warnings being treated as errors