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()



{
* *** *** ** *** * * n,a=0,b=0,c=0,d=0,e=0,f=0,g=0,h=0;
* * * ***** ** * *** * *** * ** * * * * ** *


* * ***** **** **** (n!=0)
* * * ** * * * **** * * *** * *** * ****
* * * * ** * ** ** * **** *** * ***
******* *** * ** * * (n!=0)
**** * *** * **** * *** ** * * ** * *** *** * *
*********** * * ** * * * **** * **** * ** * * * *

    if (n!=0)
**** * * ***** *** ** * *** * * ** ** ** ** ****
* * *** *** * * * ** *** * * **** ** * * *
**** * * * * ***** * ****** (n!=0)
* ******** ** * ** * * ***** ** * * * * ***** *
** **** ** * * *** * * * * * * * *** *** **
* * * ** **** ** * (n!=0)
** * *** * *** ***** ****** * *
* ** * * * * ** **** ** * * ** * *** * *** * *
***** * * * * (n!=0)
* * *** * ******** * * ******** ******* ****
** **** ***** ** * * * * *** * * ****
** * * ** * ********* ** * (n!=0)
* * **** *** *** *** * * ** * ** ** ****
* ** ** ** * *** ** * * ** ** ** * * ** *
* * ** *** * **** * * * (n!=0)
* ** ** * ** * * ****** *** * * * ** **** **** *** **
** * ** * **** * * **** * * (h)
** * * ***** ** * ** * * * *** *** ** ** * * ** ***** **
**** *** * *** *** ** (g)
* ******* ** * ** * * *** *** ** * ** * * (h==0)
* ** *** **** *** ** * * * * * * * * * ** *
** ** * ** * ****** * (f)
* ** ** * *** *** * * * * * ** * * * * (h==0 && g==0)
** * ** * * *** * ***** *** * **** **** * ***
* * * * ** ** **** * ** ** (e)
* ** * * ****** * * * *** * * ** * * * ** * * (h==0 && g==0 && f==0)
*** * **** * **** ** ** * * ** ** ****** ****
** * * ** * *** * *** (d)
**** * * **** ** ***** ***** *** (h==0 && g==0 && f==0 && e==0)
* ** ******* *** **** ***** * ** * ** ** *
* * ****** ***** *** ** (c)
**** ** ***** ********** * ** * * * * *** * (h==0 && g==0 && f==0 && e==0 && d==0)
** * * * *** * * * * ** * * * * * * * ***
** ** *** ** ** **** *** * (b)
** * ** ***** ***** * * *** **** *** * * (h==0 && g==0 && f==0 && e==0 && d==0 && c==0)
** * ** ** * ** *** * ** * *** * ** *
* **** ** * ** * * ** ** (a)
** * ** ***** * * * * * ******* * ** (h==0 && g==0 && f==0 && e==0 && d==0 && c==0 && b==0)
** * *** ******** *** ** *** * * * **


* * ** * ** * * * * 0;





}

Comments

prog.c: In function 'main':
prog.c:9:5: error: this 'if' clause does not guard... [-Werror=misleading-indentation]
     if (n!=0)
     ^~
prog.c:11:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
         n=n/2;
         ^
prog.c:12:5: error: this 'if' clause does not guard... [-Werror=misleading-indentation]
     if (n!=0)
     ^~
prog.c:14:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
         n=n/2;
         ^
prog.c:15:5: error: this 'if' clause does not guard... [-Werror=misleading-indentation]
     if (n!=0)
     ^~
prog.c:17:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
         n=n/2;
         ^
prog.c:18:5: error: this 'if' clause does not guard... [-Werror=misleading-indentation]
     if (n!=0)
     ^~
prog.c:20:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
         n=n/2;
         ^
prog.c:21:5: error: this 'if' clause does not guard... [-Werror=misleading-indentation]
     if (n!=0)
     ^~
prog.c:23:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
         n=n/2;
         ^
prog.c:24:5: error: this 'if' clause does not guard... [-Werror=misleading-indentation]
     if (n!=0)
     ^~
prog.c:26:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
         n=n/2;
         ^
prog.c:27:5: error: this 'if' clause does not guard... [-Werror=misleading-indentation]
     if (n!=0)
     ^~
prog.c:29:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
         n=n/2;
         ^
cc1: all warnings being treated as errors

Answer 2

Hidden content!
* ** * ** ** **

int ** ** **



int main()

{
* ** * * **** * ** *

b=a%2;
* **
* * **
* **
** * *****
* ****
** *** **
* *** *


**** * ** ** * * * ** * *







return 0;



}

Comments

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

Answer 3

Hidden content!
** ** * * ** ** *

int ** ***



int main()

{
* *** * *** * * ***** *

b=a%2;
* *
* *
* * *
* * * **
** ***
* * * *
** * *** *


** * * * * * * * ** **** *







return 0;



}

Comments

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

Answer 4

Hidden content!
#include * ** ******

int *****

{

int i,n;
* **** ** ***** ******
** ***** * * * ** *** * * * ** ** * **

}

Comments

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

Answer 5

Hidden content!
*** *** ** * * *

int *



int main()

{
**** * * * * *** ** ****
** *
* **
*
* ***
*** *
* * *






** * * **** * * * *






* 0;



}

Comments

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

Answer 6

Hidden content!
**** * *** * *

int * * ****



int main()

{
* ** *** * * * * * **
*
********
***
*** *
** *
* ** ***






**** **** * ******** *






* 0;



}

Comments

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

Answer 7

Hidden content!
#include <stdio.h>

int main (void)

{
* * * **** * * * ***** *** a,b,c,d,e,f,g,h,i;
* *** * * * ** *** * * ****** **** * *
* * * * ** * * ***
* ** * *
* ** * * **** *** ** * *
*** ** ******* * ** * * **** **
** * *** * * * * * **
* * * * * ** * ** **
* * * ** *** *** *
** * ** ** *** *

    if ** * ***** * ** * * * ** * *** * ***** * * * *** ***** ** *** * **** * * ** *** ** ** *
* ** * ** ***** * * * * ** * ***** *** * * ***** * ** * ****

    }

    if ((b==0)&&(c!=0)){
*** * ** * * ** **** ** ** * * * *** *** ** * * * **** ***

    }

    if * * ** ** * ** * * * * ***
* *** *** *** *** **** * ******* * ** * * ** *** ** * * * ** * ****

    }
** **** ** *** *** * ** *** ** *** * * ***** ** ** ** ** * **
**** * ** * * * **** *** * ** * **** ** * * ** * *** * * *** * **

    }
* ****** ** * * * ** ** *** ** * *** * * ** *** *** * * ** *** ** ***** ** **
****** ** * * * * * ** ** * ** ******** * * ** ****** *** * ** *

    }
* * ** ** ** * ** *** * * ** ** * *** * ** * * * * *** * * ****** ** * ***** * **
** ** ** ** *** * * *** * * * * ** *** *** ** ** ** * ** *

    }
** ********* * *** ** * * *** ** **** ***** * * ***** * * * * * ** ** ** * ** *
*** * * * *** ***** * * *** * * * * *** * * **** * ** *

    }

    if ** ** * **** * * * * * ** * * * ** ****** **** * ** * ** ** * * * * * **
********* *** **** ** ******** **** **** ** ** * * * ** ** ***

    }
* * * **** ***** * *** *** * * * * **** *** ** * * * ** ***** ** * * * *** ** * ** ** ** * ** * * *** *
* **** *** * * * ** * *** ***** ****

    }
** *** *** ** ** * * **** 0;

}

Comments

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

Answer 8

Hidden content!
* * * *** ** *

int * * *



int main()

{
* ** ****** *******
**
* *
* ** * **
** **
**** ** *
* * **






* * * * *** * ** ** *****






** * 0;



}

Comments

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

Answer 9

Hidden content!
** * **
* *


* * ****
*


* *
**


*
****
** **




** ** *****






* *


*

Comments

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

Answer 10

Hidden content!
**** *** * ** *

int *



int main()

{
**** * * ** **** ******
* *
** * ***
* ***
* * *
* * * **
***** * *






* * * * **** *** *****






** 0;



}

Comments

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