Question

I need to convert a 20digits decimal to binary using C programming. What buffer will I create, because it will be very large, even the calculator can’t compute converting 20 digits to Binary.

here is sample of what i intend to accomplish:

Let is assume this code:
I am type this value via my keyboard into the buffer. Meanwhile, I am using an AT85C55WD Mcu.

unsigned char idata token[20]=(2,3,5,6,3,3,4,4,3,2,4,4,6,7,4,3,4,5,3,3);

I want a result

type-define variable convrt_token= 23562244324467434533;

Is this possible using C? If it is, then please how do i go about it?

Answer 1

Here is elegent solution….:)

 #include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<math.h>
#include<unistd.h>
#include<assert.h>
#include<stdbool.h>
#define max 10000
#define RLC(num,pos) ((num << pos)|(num >> (32 - pos)))
#define RRC(num,pos) ((num >> pos)|(num << (32 - pos)))

void tobinstr(int value, int bitsCount, char* output)
{
    int i;
    output[bitsCount] = '\0';
    for (i = bitsCount - 1; i >= 0; --i, value >>= 1)
      {
             output[i] = (value & 1) + '0';
      }
}


  int main()
   {
    char s[50];
    tobinstr(65536,32, s);
    printf("%s\n", s);
    return 0;
   }