Initial commit

ch2/tips.c

@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+void test(int x)
+{
+    x = 1024;
+    printf("test 函数内部：x = %d\n", x);
+}
+
+int main()
+{
+    int x = 1;
+    printf("调用 test 函数前：x = %d\n", x);
+    test(x);
+    printf("调用 test 函数后：x = %d\n", x);
+}