输入了习题14的代码

ex13/vedio

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+http://ewm.ptpress.com.cn:8085/preview?qrCode=qr2018001486&verified=true

ex14/Makefile

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+CFLAGS=-Wall -g

ex14/ex14.c

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+#include <stdio.h>
+#include <ctype.h>
+
+// forward declarations
+int can_print_it(char ch);
+void print_letters(char arg[]);
+
+void print_arguments(int argc, char *argv[])
+{
+    int i = 0;
+
+    for (i = 0; i < argc; ++i)
+    {
+        print_letters(argv[i]);
+    }
+}
+
+void print_letters(char arg[])
+{
+    int i = 0;
+    char ch = 0;
+
+    for (i = 0; arg[i] != '\0'; ++i)
+    {
+        ch = arg[i];
+
+        if (can_print_it(ch))
+        {
+            printf("'%c' == %d ", ch, ch);
+        }
+    }
+
+    printf("\n");
+}
+
+int can_print_it(char ch)
+{
+    return isalpha(ch) || isblank(ch);
+}
+
+int main(int argc, char *argv[])
+{
+    print_arguments(argc, argv);
+
+    return 0;
+}