From c57efe1570449fb0b08f5e91f3fe5e8c6006c2b5 Mon Sep 17 00:00:00 2001
From: Wu Mianzhi <10215501411@stu.ecnu.edu.cn>
Date: Fri, 16 Sep 2022 21:33:24 +0800
Subject: [PATCH] finish quiz 6

---
 lab2/datalab-handout/bits.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lab2/datalab-handout/bits.c b/lab2/datalab-handout/bits.c
index c9bb625..42b53b7 100644
--- a/lab2/datalab-handout/bits.c
+++ b/lab2/datalab-handout/bits.c
@@ -236,7 +236,11 @@ int isAsciiDigit(int x) {
  *   Rating: 3
  */
 int conditional(int x, int y, int z) {
-  return 2;
+  int signx = (!x << 31) >> 31; // if x == 0 signx 111, if x != 0 signx 00000
+  int ywhenx = (~signx) & y; // if signx 111 is 0
+  int zwhenx = (signx) & z;
+  int result = ywhenx | zwhenx;
+  return result;
 }
 /* 
  * isLessOrEqual - if x <= y  then return 1, else return 0