convert fixed point number to float point number

fix2float.c

#include <stdio.h>
#include <math.h>
#define FIXED_BIT 12

float fix2float(unsigned short int n)
{
    float ret = 0.0;
    int integer_part;
    int i;

    integer_part = (n >> 12);
    ret += integer_part;
    for (i = 0; i < FIXED_BIT; i++) {
        ret += ((n >> (FIXED_BIT - i - 1)) & (0x01)) * (1.0 / pow(2, i+1));
    }

    return ret;
}

int main()
{
    unsigned short int n;
    n = 10240; // 2.5
    printf("%d => %f\n", n, fix2float(n));
    n = 10752; // 2.625
    printf("%d => %f\n", n, fix2float(n));
    return 0;
}