添加include指令

data/3.C语言高阶/4.预处理器/2.#include指令/calc.h

+// 标题: 定义一个 C语言的头文件
+// 描述: 头文件可以被其他文件代码通过 #include "xxx.h"
+// 导入，下面哪个选项的头文件的实现正确。
+
+#ifndef CALC_H
+#define CALC_H
+
+int calc(char op, int x, int y) {
+  switch (op) {
+  case '+':
+    return x + y;
+  case '-':
+    return x - y;
+  case '*':
+    return x * y;
+  case '/':
+    return x / y;
+  default:
+    return 0;
+  }
+}
+
+#endif
\ No newline at end of file

data/3.C语言高阶/4.预处理器/2.#include指令/calc.json

+{
+    "type": "code_options",
+    "author": "幻灰龙",
+    "source": "calc.h",
+    "multiline":[
+        {
+            "#ifndef CALC_H": "",
+            "#define CALC_H": "",
+            "#endif": ""
+        },
+        {
+            "#define CALC_H": ""
+        },
+        {
+            "#ifndef CALC_H": ""
+        }
+    ]
+}
\ No newline at end of file

data/3.C语言高阶/4.预处理器/2.#include指令/calc_test.c

+// 标题: 简易四则运算
+// 描述: 假设"calc.h"和本文件在同一个目录下，计算 (1+2)*(2-1)/2
+
+#include "calc.h"
+#include <stdio.h>
+
+int main(int argc, char **args) {
+  printf("%d", calc('/', calc('*', calc('+', 1, 2), calc('-', 2, 1)), 2));
+  return 0;
+}
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data/3.C语言高阶/4.预处理器/2.#include指令/calc_test.json

+{
+    "type": "code_options",
+    "author": "幻灰龙",
+    "source": "calc_test.c",
+    "multiline":[
+        {
+            "#include \"calc.h\"":"#include <calc.h>"
+        },
+        {
+            "#include \"calc.h\"":"using \"calc.h\""
+        },
+        {
+            "#include \"calc.h\"":"#include(\"calc.h\")"
+        }
+    ]
+}
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data/3.C语言高阶/4.预处理器/2.#include指令/config.json

@@ -6,5 +6,8 @@
     "C语言"
   ],
   "children": [],
-  "export": []
+  "export": [
+      "calc.json",
+      "calc_test.json"
+  ]
 }
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