/* This file takes a value strictly between 0 and 1 in floating point format and
 * converts it to a 20 bit hex integer (decimal immediately to the left of
 * the leftmost bit.
 */


#include <stdlib.h>
#include <stdio.h>

main(int argc, char *argv[]){
	float convert;
	int exp, i;
	unsigned int result = 0, mant;

	if (argc < 2) {
		printf ("Usage: floattohex <value>\n");
		exit (-1);
	}

	convert = (float)atof(argv[1]);	

	exp = (*(unsigned int *)&convert) & 0x7F800000;
	mant = (*(unsigned int *)&convert) & 0x007FFFFF;
	exp = exp >> 23;
	exp = exp - 127;

	result |= 1 << (20 + exp);

	for (i = 0; i < (20 + exp); i++)
		if (mant & (1 << (23 - i)))
			result |= 1 << (20 + exp - i);
	
	printf ("%05X\n", result);

}