复合运算符

自加+ +	i++; //相当于 i = i + 1;
自减--	i–-; //相当于 i = i – 1;
复合加+=	i+=5; //相当于 i = i + 5;
复合减-=	i-=5; //相当于 i = i – 5;
复合乘*=	i*=5; //相当于 i = i * 5;
复合除/=	i/=5; //相当于 i = i / 5;
复合与&=	i&=5; //相当于 i = i & 5;
复合或|=	i|=5; //相当于 i = i | 5;