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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}

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;

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**  **    *  **  * **     * **  * * = 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;

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

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

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**** ** *** ***   ***  *  * *****     ***  *  *  
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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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***  * ** ***** * *** *  **     ***  * ** ***   *  *  * ** *
  ** *** ***** **** *** ****  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()
{
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 ****             ******  ****   ****   * *    *  *** * *
*** *   * ***  *** ***** *   *  (a<256)
    {   b=a%2;
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*  ** ** * *** **** *** * **  *** * **    * **  *   *   * **** ** **
****  *  *  ** ** ** ******  ** * 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()
{
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**********   ***** ***** ** ** **  *    ***     * * 
    if (a<256)
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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