无符号整数变量ux和uy的声明和初始化如下:
unsigned ux = x;
unsigned uy = y;
若sizeof(int) =4,则对于任意int型变量x和y,判断以下关系表达式是否永真。若永真则给出证明;若不永真则给出结果为假时x和y的取值。
(1)(x*x)>=0 (2)(x-1<0) || x>o
(3)x<0 || -x<=0 (4)x>0 || -x>=0
(5)x&0xf! = 15 || (x<<28)<0 (6)x>y==(-x<-y)
(7)-x+-y==-(x+y) (8)(int)(ux-uy)==-(y-x)
(9)((x>>2)<<2) <=x (10)x*4+y*8==(x<<20)+(y<<3)
(11)x/4+y/8==(x>>2)+(y>>3) (12)x*y==ux*uy
(13)x+y==ux+uy (14)x*-y+ux*uy==-x