LinuxQuestions.org - Decimal to binary

- Programming (https://www.linuxquestions.org/questions/programming-9/)

- - Decimal to binary (https://www.linuxquestions.org/questions/programming-9/decimal-to-binary-284986/)

maldini1010

02-01-2005 01:39 PM

Decimal to binary

Hi,

Does anyone know of a function which would convert a decimal number into its equivalent binary(8bits) string.

I was on windows and was using itoa, however this functin is no where to be found on my linux system.

Thanks
maldini

itsme86

02-01-2005 01:53 PM

Code:

{

  int num = 86;

  char str[50];



  sprintf(str, "%d", num);

}

maldini1010

02-01-2005 01:59 PM

Hi, I just tried the piece of code you sent me and what this code seems to do, is to convert the interger into a string. what i need is something that you pass it the number 7 for example and it will return you 00000111.

Let me know what you think
Thanks for the help

itsme86

02-01-2005 02:13 PM

I didn't realize itoa() did that for you. It wouldn't be hard to create a function to do that...give me a sec.

itsme86

02-01-2005 02:18 PM

Here you go:

Code:

itsme@dreams:~/C$ cat ctob.c

#include <stdio.h>



char *ctob(unsigned char c)

{

  static char buf[9];

  int i;



  for(i = 0;i < 8;++i)

    buf[i] = (c & (1 << (7 - i))) ? '1' : '0';

  buf[8] = '\0';



  return buf;

}



int main(void)

{

  char c = 86;



  printf("%s\n", ctob(c));

  return 0;

}

Code:

itsme@dreams:~/C$ ./ctob

01010110

jim mcnamara

02-01-2005 02:23 PM

try something like this

Code:

#include <limits.h>

void printBinary(unsigned int input)

{

  int x=sizeof(unsigned int);

  x*=CHAR_BIT;

  for(--x; x>=0; --x)

  {

        fprintf(stdout,"%d", !!((unsigned int)1<<x & input) );

  }

}

maldini1010

02-01-2005 04:03 PM

thanks guys, I was sure there was a function part of a linux library which did this. I guess some things are better done from scratch. Thanks a lot guys.

maldini

All times are GMT -5. The time now is 11:21 PM.