#include <stdio.h>

typedef union {
    struct {
        long long unsigned sigma:52;
        unsigned n:11;
        unsigned s:1;
    } bits;
    double value;
} ieeebits;

//  Print 52 bits in binary
void p52bits(long long unsigned b){
    long long unsigned i;
    for(i=1llu<<51;i>0;i>>=1) {
        putchar(b&i?'1':'0');
    }
}

int main(){
    ieeebits x;
    x.value=10.0;
    printf("x=%g\n",x.value);
    printf("sigma=%llx\n",(long long unsigned)x.bits.sigma);
    printf("    n=%u\n",(unsigned)x.bits.n);
    printf("    s=%u\n",(unsigned)x.bits.s);
    printf("\nInterpretation in binary disregarding special cases:\n");
    printf("%c1.",x.bits.s?'-':'+');
    p52bits(x.bits.sigma);
    printf("*2^%d\n",x.bits.n-1023);
    return 0;
}