fix quiz7

lab2/datalab-handout/bits.c

@@ -252,13 +252,14 @@ int conditional(int x, int y, int z) {
 int isLessOrEqual(int x, int y) {
   int signx = x >> 31;
   int signy = y >> 31;
-  int isnegpos = (signx ^ signy) & (~signx); // 0xFFFFF if signx = 1 sign y = 0
+  int isnegpos = (signx ^ signy) & (signx); // 0xFFFFF if signx = 1 sign y = 0
+  int isposneg = (signx ^ signy) & (signy);
   int sign1 = ~(1 << 31); // 01111111...111
   int absx = x & sign1;
   int absy = y & sign1;
   int diff = absy + (~absx) + 1;
   int signdiff = diff >> 31;
-  int res = !isnegpos & !signdiff;
+  int res = !!isnegpos | (!isnegpos & !signdiff & !isposneg);
   return res;
 }
 //4