C语言，float double数据转换成HEX

#includevoid main(){        double a;        float b;        unsigned char *p,*q;        unsigned char m[sizeof(a)]={0};        int i;        a=6559.8;        b=-659.8;        p=(unsigned char *)(&a);        q=(unsigned char *)(&b);        for(i=0;i<sizeof(a);i++)        {                m[i]=*(p+i);                //printf("%02X",*(p+i));                printf("%X",m[i]);        }        printf("n");        for(i=0;i<sizeof(a);i++)        {                printf("%02X",*(p+i));        }        printf("n");        printf("%03dn",sizeof(a));        printf("n");        for(i=0;i<sizeof(b);i++)        {                printf("%02X",*(q+i));        }        printf("n");        printf("%03dn",sizeof(b));        printf("n");}