SYSTEM LEVEL PROGRAMMING BY C

Important structure and union:The header file dos.h defines two important structures and one union. They are:
1. struct BYTEREGS {unsigned char al, ah, bl, bh;unsigned char cl, ch, dl, dh;   };2. struct WORDREGS {unsigned int ax, bx, cx, dx;unsigned int si, di, cflag, flags;   };3. union REGS {struct WORDREGS x;struct BYTEREGS h;  };Note: Try to remember above structures and union.There is