add bit filed

data/3.C语言高阶/3.位运算/7.对齐特性/config.json → data/3.C语言高阶/3.位运算/6.对齐特性/config.json

@@ -6,5 +6,8 @@
     "C语言"
   ],
   "children": [],
-  "export": []
+  "export": [
+      "pack01.json",
+      "pack02.json"
+  ]
 }
\ No newline at end of file

data/3.C语言高阶/3.位运算/6.对齐特性/pack01.json

+{
+    "type": "code_options",
+    "author": "幻灰龙",
+    "source": "pack01.md"
+}
\ No newline at end of file

data/3.C语言高阶/3.位运算/7.对齐特性/pack01.md → data/3.C语言高阶/3.位运算/6.对齐特性/pack01.md

-# 结构体位对齐
+# 结构体位对齐(1)
 
 假设机器字是8 bytes，下面代码的占据的内存大小是多大？
 ```c
@@ -14,13 +14,14 @@ struct Test{
 ## template
 
 ```c
+#include <stdio.h>
 struct Test{
     char *p;
     char c;
     int x;
 };
 int main(int argc, char**){
-    print("%d", sizeof(struct Test))
+    printf("%d", sizeof(struct Test));
     return 0;
 }
 ```

data/3.C语言高阶/3.位运算/6.对齐特性/pack02.json

+{
+    "type": "code_options",
+    "author": "幻灰龙",
+    "source": "pack02.md"
+}
\ No newline at end of file

data/3.C语言高阶/3.位运算/6.对齐特性/pack02.md

+# 结构体位对齐(2)
+
+结构体需要与其最宽的成员为基准对齐，假设机器字是8 bytes，下面代码的占据的内存大小是多大？
+```c
+struct foo3 {
+    char *p;
+    char c;
+};
+```
+
+## template
+
+```c
+#include <stdio.h>
+struct foo3 {
+    char *p;
+    char c;
+};
+int main(int argc, char**){
+    printf("%d", sizeof(struct foo3));
+    return 0;
+}
+```
+
+## 答案
+
+```c
+16 bytes
+```
+
+## 选项
+
+### 选项1
+
+```c
+9 bytes
+```
+
+### 选项2
+
+```c
+12 bytes
+```
+
+### 选项3
+
+```c
+8 bytes
+```
\ No newline at end of file

data/3.C语言高阶/3.位运算/7.位字段/bit_field.c

+#include <stdio.h>
+struct foo5 {
+  int flip : 1;
+  int nybble : 4;
+  int septet : 7;
+};
+int main(int argc, char **argv) {
+  printf("%lu", sizeof(struct foo5));
+  return 0;
+}
\ No newline at end of file

data/3.C语言高阶/3.位运算/7.位字段/bit_field.json

+{
+    "type": "code_options",
+    "author": "幻灰龙",
+    "source": "bit_field.md"
+}
\ No newline at end of file

data/3.C语言高阶/3.位运算/7.位字段/bit_field.md

+# 十六进制转换
+
+利用位域，你能声明比字符宽度更小的成员，低至１位。假设机器字是8 bytes，下面的结构体大小是？
+
+```c
+#include <stdio.h>
+struct foo5 {
+  int flip : 1;
+  int nybble : 4;
+  int septet : 7;
+};
+int main(int argc, char **argv) {
+  printf("%lu", sizeof(struct foo5));
+  return 0;
+}
+```
+
+## template
+
+```c
+#include <stdio.h>
+struct foo5 {
+  int flip : 1;
+  int nybble : 4;
+  int septet : 7;
+};
+int main(int argc, char**){
+    printf("%lu", sizeof(struct foo5));
+    return 0;
+}
+```
+
+## 答案
+
+```c
+4
+```
+
+## 选项
+
+### 选项1
+
+```c
+16
+```
+
+### 选项2
+
+```c
+32
+```
+
+### 选项3
+
+```c
+8
+```
\ No newline at end of file

data/3.C语言高阶/3.位运算/6.位字段/config.json → data/3.C语言高阶/3.位运算/7.位字段/config.json

@@ -6,5 +6,7 @@
     "C语言"
   ],
   "children": [],
-  "export": []
+  "export": [
+      "bit_filed.json"
+  ]
 }
\ No newline at end of file