#include <stdio.h>
#include <stdint.h>

float hex2float(char *hex);
void float2hex(float f, char *buff);


int main()
{
	printf("%f\n", hex2float("3f800000"));

	char hex[9];
	float2hex(1.0, hex);
	printf("%s\n", hex);
}


float hex2float(char *hex)
{
	uint64_t i;
	sscanf(hex, "%lx", &i);
	return *(float *)&i;
}


void float2hex(float f, char *buff)
{
	for(uint8_t i = 0; i < 4; i++)
		sprintf(buff + 2*i , "%02hhx", *((uint8_t *)&f + 3-i));
}