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;

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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;
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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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***   * **   **    * * *  **     ***  * * ****    ***   
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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()
{
  * * * * ******   * * *   * * a,b,c,d,e,f,g;
     **  **  *  ** ******   *   *   * ** ** *  * * **   * 
    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