#include <math.h>
#include <stdio.h>

#define spexpmask 0x7F800000
#define spframask 0x007FFFFF

main(){
	float s;
	unsigned int  *p;

	p = (unsigned int *) &s;
	printf("enter the floating point number:");
	fflush(stdin);
	scanf("%f", &s);
	printf("The number in ieee fp single precision is %08x\n", *p);

	printf("The exponent part is %02x=%d(base 10)\n\texp=unbias exponent(exponent part - 127)=%d\n", 
		(*p & spexpmask) >> 23,
		(*p & spexpmask) >> 23,
		((*p & spexpmask) >> 23) - 127
		);
	printf("The fraction part is %06x=%d(base 10)\n",
		*p & spframask,
		*p & spframask);
	printf("The significant is 1.f=1.%06x=%f(base 10)\n",
		(*p & spframask) << 1,
		((*p & spframask) + pow(2.0,23.0)) /  pow(2.0,23.0)
		);
	if (*p >> 31) {
	   printf("sign*1.f*2**exp=-%f*2**%d=%f\n",
		((*p & spframask) + pow(2.0,23.0)) /  pow(2.0,23.0),
		((*p & spexpmask) >> 23) - 127,
		s);
	} else {
	   printf("sign*1.f*2**exp=%f*2**%d=%f\n",
		((*p & spframask) + pow(2.0,23.0)) /  pow(2.0,23.0),
		((*p & spexpmask) >> 23) - 127,
		s);
	}
}