完成习题11

ex11/Makefile

@@ -0,0 +1 @@
+CFLAGS=-Wall -g

ex11/ex11.c

@@ -1,33 +1,44 @@
 #include <stdio.h>
+#include <string.h>
 
 int main(int argc, char *argv[])
 {
     int numbers[4] = {0};
-    char name[4] = {'a'};
+    // char name[4] = {'a', 'a', 'a', 'a'};
+    // char name[4];
+    char name[4] = {255, 255, 255, 255};
+    char* p = numbers;
+
+    memcpy(p, &name[0], sizeof(char));
+    memcpy(p + 1, &name[1], sizeof(char));
+    memcpy(p + 2, &name[2], sizeof(char));
 
     // first, print them out raw
-    printf("number: %d %d %d\n", numbers[0], numbers[1], numbers[2], numbers[3]);
+    printf("number: %x %d %d %d\n", numbers[0], numbers[1], numbers[2], numbers[3]);
 
     printf("name each: %c %c %c %c\n", name[0], name[1], name[2], name[3]);
 
     printf("name: %s\n", name);
 
     // set up the numbers
-    numbers[0] = 1;
-    numbers[1] = 2;
-    numbers[2] = 3;
-    numbers[3] = 4;
+    numbers[0] = '1';
+    numbers[1] = '2';
+    numbers[2] = '3';
+    numbers[3] = '4';
 
     // set up the name 
-    name[0] = 'Z';
-    name[1] = 'e';
-    name[2] = 'd';
-    name[3] = '\0';
+    name[0] = 255;
+    name[1] = 255;
+    name[2] = 255;
+    name[3] = 0;
+    // name[3] = 'A';
+
+    // printf("%d", name);
 
     // then print them out initialized
     printf("numbers: %d %d %d %d\n", numbers[0], numbers[1], numbers[2], numbers[3]);
 
-    printf("name each: %c %c %c %c\n", name[0], name[1], name[2], name[3]);
+    printf("name each: %x %x %x %x\n", name[0], name[1], name[2], name[3]);
 
     // print the name like a string
     printf("name: %s\n", name);

ex11/ex11_copy.c

@@ -0,0 +1,43 @@
+#include <stdio.h>
+
+int main(int argc, char *argv[])
+{
+    int numbers[4] = {0};
+    char name[4] = {'a'};
+
+    // first, print them out raw
+    printf("number: %d %d %d\n", numbers[0], numbers[1], numbers[2], numbers[3]);
+
+    printf("name each: %c %c %c %c\n", name[0], name[1], name[2], name[3]);
+
+    printf("name: %s\n", name);
+
+    // set up the numbers
+    numbers[0] = 1;
+    numbers[1] = 2;
+    numbers[2] = 3;
+    numbers[3] = 4;
+
+    // set up the name 
+    name[0] = 'Z';
+    name[1] = 'e';
+    name[2] = 'd';
+    name[3] = '\0';
+
+    // then print them out initialized
+    printf("numbers: %d %d %d %d\n", numbers[0], numbers[1], numbers[2], numbers[3]);
+
+    printf("name each: %c %c %c %c\n", name[0], name[1], name[2], name[3]);
+
+    // print the name like a string
+    printf("name: %s\n", name);
+
+    // another way to use name
+    char *another = "Zed";
+
+    printf("another: %s\n", another);
+
+    printf("another each: %c %c %c %c\n", another[0], another[1], another[2], another[3]);
+
+    return 0;
+}