Printing a Character from Binary

Is there anyway to print a character which you have BINARY for? Such as:

Code:

---


char Binary[]="10010110";
int x;

x=atoi(Binary);
printf("??");

---

I have the binary digits store in a character array...then I use atoi to put them into an int array...but when I try to display using %c, it displays the character of "10010110"....it uses that as the actual number...not the number in binary.....Anyone?!

As far as I know, there isn't any standard function to handle this. The code for such a function, however, isn't too terribly complicated...

Code:

---

int atob (const char * intMe)
{
 int result = 0;
 int i;
 for (i = 0; intMe[i] != '\0'; i++)
 {
  result <<= 1; // Shift the values in result left once.  Same ase
    // result *= 2;

  // if intMe[i] == '0', we don't do anything.
  if (intMe[i] == '1')
  {
  result += 1;
  }
 }

 return result;
}

---

Check this!
If you e-mail me I could send some source code to you I´m writing at the moment which does exactly the same.
Because I have hardly time for programming at the moment, it will last about a week until I have finished it.

klausi

I made one during Chemistry class...it's pretty simple...goes like this:

Code:

---

char FullBinary[9]="10101100";
int Binary[8]={128,64,32,16,8,4,2,1};
int x,Total;

  for (x=0; x<=8; x++);
      if (FullBinary[x]==1)  { 
          Total = Total+Binary[x]; 
          x++;    }

      if (FullBinary[x]==0)  {
          x++;
                      }
    }

 printf("%c",Total);

---

See?

Here is my solution now. Finished it yesterday:

Code:

---

#include <stdio.h>
#include <stdlib.h> /* for allocating memory for the strings */

#define PUFFER 256

int lenof(char *str); /* returns the length of a string inclusive the ending '\0' */
void asctobin(void); /* converts ASCII-characters into binary digits */
void bintoasc(void); /* converts binary digits into ASCII characters */

unsigned char bin[]={1,2,4,8,16,32,64,128}; /* bitfield */


int main(void)
{
        char chose;

        for(chose=0;chose<50;chose++,printf("\n")) ; /* Clear screen */

again:
        printf("Enter \'A\' to convert ASCII to binary or \'B\' to convert binary into ASCII: ");
        scanf("%c",&chose);
        if(chose=='A' || chose=='a') asctobin();
        else
        {
                if(chose=='B' || chose=='b') bintoasc();
                else{
                        rewind(stdin); /* back to the begin of stdin; if more then one character was entered */
goto again;} /* only accepts 'A','a','B' and 'b' as inputs */
        }

        return 0;
}


void asctobin(void)
{
        char *string,c;
        int count,len;

        if((string=(char*)malloc(PUFFER))==NULL)
        {
                printf("Cannot allocate enough memory!");
                exit(1); /* exit with the return code an error */
        }


        printf("Enter string (max length: 255 characters): ");
        rewind(stdin); /* back to the begin of stdin */
        fgets(string,PUFFER-1,stdin);

        len=lenof(string);

        for(;len>1;len--) /* as often as the value for the length of the inputed string */
        {
                c=*string; /* the character *string points to at the moment */
                for(count=7;count>=0;count--)
                {       
                        if(c>=bin[count])
                        {
                                printf("1");
                                c-=bin[count];
                        }else
                        printf("0");
                }
                *string++;
                printf(" ");
        }
}


int lenof(char *str)
{
        int count=0;

        while(*str!='\0' && count<256)
        {
                *str++;
                count++;
        }

        return(count);
}


void bintoasc(void)
{
        char *string,c;
        int count=0,len;

        if((string=(char*)malloc(PUFFER))==NULL)
        {
                printf("Cannot allocate enough memory!");
                exit(1); /* exit with the return code for an error */
        }


        printf("Enter digits (max 255):");
        rewind(stdin); /* back to the begin of stdin */
        fgets(string,PUFFER-1,stdin);

        len=lenof(string);

        for(;len>1;len--) /* as often as the value for the length of the inputed string */
        {
                if(*string=='1')
                {
                        c+=bin[7-count];
                        count++;
                }else
                if(*string=='0') count++;

                if(count%8==0)
                {
                        printf("%c",c);
                        count=c=0;
                }

                *string++;
        }
}

---

klausi

Could you occassionally give some comments about my programming style?
It´s actually my second program I wrote in C.
Maybe you can also give some better comments than I wrote into the program.
I programmed the function lenof() on myself, because I think it´s more efficient than including the string library.

klausi

Hi!

There is a library function called strtol...

Code:

---

...
#include <stdlib.h>
...
char Binary[]="10010110";
int x;
...
x=strtol(Binary, (char **)NULL, 2);
printf("%i\n", x);
...

---

alex