完成到第三章3.4 P48

ch03/endian_conv.c

@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include <arpa/inet.h>
+int main(int argc, char *argv[])
+{
+    unsigned short host_port = 0x1234;
+    unsigned short net_port;
+    unsigned long host_addr = 0x12345678;
+    unsigned long net_addr;
+
+    net_port = htons(host_port); //转换为网络字节序
+    net_addr = htonl(host_addr);
+
+    printf("Host ordered port: %#x \n", host_port);
+    printf("Network ordered port: %#x \n", net_port);
+    printf("Host ordered address: %#lx \n", host_addr);
+    printf("Network ordered address: %#lx \n", net_addr);
+
+    return 0;
+}