upload 2.19

11/11/11.49.c

@@ -1,9 +1,8 @@
 #include "s_gets.h"
+char str[80];
+char * c;
 int main (int argc, char * argv[])
 {
-    char str[80];
-    char * c;
-
     printf ("please enter a sentence. \n");
     s_gets (str, 80);
     if (argc < 2 || !strcmp (argv[1], "-p"))

12/12.1.c

@@ -0,0 +1,23 @@
+#include <stdio.h>
+//一个写代码让人看不懂的小技巧.
+int main (void)
+{
+    int x = 30;  //原始 x, 函数内通用, 不会被块内的 x 更改值.
+
+    printf ("x in outer block: %d at %p\n", x, &x);
+    {
+        int x = 77; //定义在块内, 离开块时被销毁.
+        printf ("x in inner block: %d at %p\n", x, &x);
+    }
+    printf ("x in outer block: %d at %p\n", x, &x);
+    while (x ++ < 33)
+    {
+        int x = 100;  //定义在 while 块内.
+        x ++;
+        printf ("x in while loop: %d at %p\n", x, &x);
+    }
+    //每次离开循环时, while 中的 x 被销毁, 进入时被重新定义.
+    printf ("x in outer block: %d at %p\n", x, &x);
+
+    return 0;
+}

12/12.10.c

@@ -0,0 +1,6 @@
+#include <stdio.h>
+int main (void)
+{
+
+    return 0;
+}

12/12.2.c

@@ -0,0 +1,20 @@
+#include <stdio.h>
+int main (void)
+{
+    int n = 8;
+
+    printf ("Intially, n = %d at %p\n", n, &n);
+    for (int n = 1; n < 3; n ++)
+        printf ("loop 1: n = %d at %p\n", n, &n);
+    printf ("After loop 1, n = %d at %p\n", n, &n);
+    for (int n = 1; n < 3; n ++)
+    {
+        printf ("loop 2 index n = %d at %p\n", n, &n);
+        int n = 6;
+        printf ("loop 2: n = %d at %p\n", n, &n);
+        n ++;
+        printf ("loop 2 - 2: n = %d at %p\n", n, &n);
+    }
+    printf ("After loop 2, n = %d at %p\n", n, &n);
+    return 0;
+}

12/12.3.c

@@ -0,0 +1,20 @@
+#include <stdio.h>
+int fade = 1;
+void trystat (void);
+int main (void)
+{
+    int count;
+    for (count = 1; count <= 3; count ++)
+    {
+        printf ("Here comes iteration %d: \n", count);
+        trystat ();
+    }
+
+    return 0;
+}
+void trystat (void)
+{
+    static int stay = 1;
+
+    printf ("fade = %d and stay = %d\n", fade ++, stay ++);
+}

12/12.4.c

@@ -0,0 +1,12 @@
+#include <stdio.h>
+//extern 使用方法
+void swe (void);
+int main (void)
+{
+    extern int coal;
+
+    printf ("%d\n", coal);
+    swe();
+
+    return 0;
+}

12/12.4_5.h

@@ -0,0 +1,2 @@
+#include <stdio.h>
+int coal = 6;

12/12.5.c

@@ -0,0 +1,11 @@
+#include "12.4_5.h"
+static int i = 0;
+extern void swe (void)
+{
+    extern int coal;
+
+    for ( ; i < coal; i ++)
+    {
+        printf ("hello c world\n");
+    }
+}

12/12.6.c

@@ -0,0 +1,48 @@
+#include <stdio.h>
+//示例1:
+int hocus;
+int magic ();
+int main (void)
+{
+    extern int hocus;
+    ...
+}
+int magic ()
+{
+    extern int hocus;
+    ...
+}
+//上文中一共出现了一个hocus, 后面两次声明起强调作用, 可以省略.
+//示例2:
+int hocus;
+int magic (void);
+int main (void)
+{
+    extern int hocus;
+    ...
+}
+int magic (void)
+{
+    //未声明变量
+    ...
+}
+//示例2中出现两个hocus, 第一个是文件头部的全局hocus变量, 第二个是main函数里的局部hocus变量.
+//全局hocus变量对main函数不可见, 因为被局部hocus变量挡住了.
+//虽然magic函数没有声明hocus变量, 它可以调用头部的全局hocus变量.
+//示例3:
+int hocus;
+int magic (void);
+int main (void)
+{
+    int hocus;//默认被声明为自动变量.
+    ...
+}
+int pocus;//因为它被声明在了main函数后面, 所以它虽然全局存在但对main函数不可见.
+int magic (void)
+{
+    auto int hocus;//现实声明为自动变量, 效果和上面差不多.
+    ...
+}
+//示例3中一共出现四个变量, 全局变量hocus, main函数中局部变量hocus,
+//magic函数中局部变量hocus和对main函数不可见的全局变量pocus.
+//全局变量对main函数和magic函数均不可见.

12/12.7.c

@@ -0,0 +1,22 @@
+#include <stdio.h>
+int units = 0;
+void critic (void);
+int main (void)
+{
+    extern int units;
+
+    printf ("how many pounds to firkin of butter? \n");
+    scanf ("%d", &units);
+    while (units != 56)
+    {
+        critic ();
+    }
+    printf ("you must have looked it up. \n");
+
+    return 0;
+}
+void critic (void)
+{
+    printf ("no luck, my friend. try again. \n");
+    scanf ("%d", &units);
+}

12/12.8.c

@@ -0,0 +1,23 @@
+#include <stdio.h>
+void report_count();
+void accumulate(int k);
+int count = 0;
+int main (void)
+{
+    int value;
+    register int i;
+
+    printf ("enter a positive integer (0 to quit): \n");
+    while (scanf ("%d", &value) == 1 && value > 0)
+    {
+        ++ count;
+        for (i = value; i >= 0; i --)
+        {
+            accumulate (i);
+        }
+        printf ("enter a positive integer (0 to quit): \n");
+    }
+    report_count ();
+
+    return 0;
+}

12/12.9.c

@@ -0,0 +1,22 @@
+#include <stdio.h>
+extern int count;
+static int total = 0;
+void accumulate (int k)
+{
+    static int subtotal = 0;
+
+    if (k <= 0)
+    {
+        printf ("loop cycle: %d\n", count);
+        printf ("subtotal: %d; total: %d\n", subtotal, total);
+        subtotal = 0;
+    }else
+    {
+        subtotal += k;
+        total += k;
+    }
+}
+void report_count ()
+{
+    printf ("loop executed %d times. \n", count);
+}

9_plus/9_plus/cmake-build-debug/.cmake/api/v1/reply/cache-v2-5d034f0ed6fae8540916.json → 9_plus/9_plus/cmake-build-debug/.cmake/api/v1/reply/cache-v2-939da9b18f962d832b46.json

@@ -127,7 +127,7 @@
 				}
 			],
 			"type" : "INTERNAL",
-			"value" : "0"
+			"value" : "8"
 		},
 		{
 			"name" : "CMAKE_COLOR_DIAGNOSTICS",
@@ -190,7 +190,7 @@
 					"value" : "C compiler"
 				}
 			],
-			"type" : "FILEPATH",
+			"type" : "STRING",
 			"value" : "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc"
 		},
 		{