finish quiz4

lab2/datalab-handout/bits.c

@@ -188,7 +188,15 @@ int isTmax(int x) {
  *   Rating: 2
  */
 int allOddBits(int x) {
-  return 2;
+  int base = 42;
+  int neg = 1 << 7;
+  int unit8 = base + neg;
+  int unit16 = (unit8 << 8) + unit8;
+  int unit32 = (unit16 << 16) + unit16;
+  int shouldunit32 = x & unit32;  
+  int allzero = shouldunit32^unit32;
+  int res = !allzero;
+  return res;
 }
 /* 
  * negate - return -x