Converting floating-point number to IEEE754 representation by using union and struct in c.

floating_point_ieee.c

#include <stdio.h>
/*
 * See also : http://class.ece.iastate.edu/arun/CprE281_F05/ieee754/ie5.html
 */

union FloatingPointIEEE754 {
	struct {
		unsigned int mantissa : 23;
		unsigned int exponent : 8;
		unsigned int sign : 1;
	} raw;
	float f;
} number;

int main() {
	number.f = -6.8;
	printf("%x, %x, %x", number.raw.mantissa, number.raw.exponent, number.raw.sign ); 
	return 0;
}