/****************************************************
Description:  This program converts an unsigned number
in base 10  to base 2.

Input: base 10 integer
Output:  binary integer


*****************************************************/

#include<string.h>
#include<stdio.h>
main()
{
  int base10;
  char binary[12];
  char b10_b2(*char , int );

      /** prompts user **/

  printf("Type in an unsigned base 10 number.\n");
  scanf(" %d", &base10);
  printf("base 10 is  %d .\n", base10);

    /** echoes to screen, then sends value of base10
        and address of binary to function **/

  b2_b10(base10, binary);
  printf(" %d in base 10 is %s in base 2.\n", base10, binary);

    /** returns value of base 10 number in base 2 **/
}

/*-----------------------------------------------------*/
/*  Function name: b10_b2                              */
/*  Description: translates unsigned base 10 integer   */
/*                to unsigned binary integer           */
/*  Input parameters: address of binary integer and    */
/*                  value of base 10 integer           */
/*  Output parameters: binary integer                  */
/*  Return Value: binary value of given base 10 number */
/*-----------------------------------------------------*/

char b10_b2(char *binary, int base10)

   /**receives value of base 10 and address of binary **/
{
  int power=1,  i = 12, bit;

  *binary[i] = base10 % 2;
  base10 /= 2;

  while (base10 > 0)
     {
       *binary[i--] = base10 % 2;
       base10 /=2;
                          /** translates decimal to binary**/
      }

        /** returns binary value of decimal to main **/

  return (*binary);
}