From 0b8e953d4b4a2648237ef8abdcefe49941413d21 Mon Sep 17 00:00:00 2001
From: wandoubaba517 <wandoubaba517@gmail.com>
Date: Sat, 2 Dec 2023 19:27:07 +0800
Subject: [PATCH] =?UTF-8?q?chapter=203=20=E6=88=AA=E6=AD=A2=E5=88=B0?=
 =?UTF-8?q?=E6=95=B4=E6=95=B0?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 c03_data/altnames.c | 25 +++++++++++++++++++++++++
 c03_data/charcode.c | 13 +++++++++++++
 c03_data/print2.c   |  8 ++++----
 3 files changed, 42 insertions(+), 4 deletions(-)
 create mode 100644 c03_data/altnames.c
 create mode 100644 c03_data/charcode.c

diff --git a/c03_data/altnames.c b/c03_data/altnames.c
new file mode 100644
index 0000000..b4a95e5
--- /dev/null
+++ b/c03_data/altnames.c
@@ -0,0 +1,25 @@
+/* altnames.c - 可移植整数类型名 */
+#include <stdio.h>
+#include <inttypes.h>   // 支持可移植类型
+
+int main(void)
+{
+    int32_t me32;   // me32是一个32位有符号整型变量
+    
+    me32 = 45933945;
+
+    printf("First, assume int32_t is int: ");
+    printf("me32 = %d\n", me32);
+    printf("Next, let's not make any assumptions.\n");
+    printf("Instead, use a \"macro\" from inttypes.h: ");
+    printf("me32 = %" PRId32 "\n", me32);
+    /*
+    PRId32 是一个宏，定义在<inttypes.h>这个头文件中。这个宏用于格式化输出32位有符号整型（int32_t）的值。
+    PRId32 用于确保正确的整数格式化，无论在哪个平台或机器上运行，都会输出32位有符号整数的正确格式。这样可以确保代码的可移植性。
+    如果你直接使用 %d 去打印 int32_t 类型的变量，可能在某些系统上得到的结果与预期不符，
+    因为 %d 可能指的是16位或64位的整数，而 int32_t 始终是32位的。
+    使用 PRId32 可以确保总是以32位的形式打印整数。
+    */
+
+    return 0;
+}
\ No newline at end of file
diff --git a/c03_data/charcode.c b/c03_data/charcode.c
new file mode 100644
index 0000000..1c7afe4
--- /dev/null
+++ b/c03_data/charcode.c
@@ -0,0 +1,13 @@
+/* charcode.c - 显示字符的代码编号 */
+#include <stdio.h>
+
+int main(void)
+{
+    char ch;
+
+    printf("Please enter a character.\n");
+    scanf("%c", &ch);
+    printf("The code for %c is %d.\n", ch, ch);
+    
+    return 0;
+}
\ No newline at end of file
diff --git a/c03_data/print2.c b/c03_data/print2.c
index acdd863..3d27ee7 100644
--- a/c03_data/print2.c
+++ b/c03_data/print2.c
@@ -3,10 +3,10 @@
 
 int main(void)
 {
-    printf("un = %ld and not %ld\n", 3000000000, 3000000000);
-    printf("end = %d and %d\n", 200, 200);
-    printf("big = %ld and not %d\n", 65537, 65537);
-    printf("verybig = %ld and not %ld\n", 12345678908642, 12345678908642);
+    printf("un = %u and not %d\n", 3000000000, 3000000000);
+    printf("end = %hd and %d\n", 200, 200);
+    printf("big = %ld and not %hd\n", 65537, 65537);
+    printf("verybig = %lld and not %d\n", 12345678908642, 12345678908642);
 
     return 0;
 }
\ No newline at end of file