float转为字节

typedef union
    {
       struct
       {
           unsigned char low_byte;
           unsigned char mlow_byte;
           unsigned char mhigh_byte;
           unsigned char high_byte;

       }f_byte ;
       float pp;

    }FLOAT;

int main()
{

    FLOAT fd;
    fd.pp=82.125;
    printf("data is %x %x %x %x",fd.f_byte.low_byte,fd.f_byte.mlow_byte,fd.f_byte.mhigh_byte,fd.f_byte.high_byte);
}