卓越14_U201414716_彭佳伟_第十七周

1、卓越14_U201414716_彭佳伟_第十七周9.7 有结构类型声明struct student int num; char name12; double scor; num, name, score分别是学好、姓名、成绩。请编程完成下列任务：（1）定义有三个元素的结构数组s并对其进行初始化，同时定义结构指针p并使其指向s0；（2）不用指针p，依次输出各个元素的各成员之值；（3）用指针p，依次输出各个元素的各成员之值。#include <stdio.h>int main(void) struct student int num; char name12; double score

2、; ; struct student student1 = 1, "abc", 100; struct student *p; p = &student1; /任务一 printf("num = %dn",student1.num); printf("name = %sn",); printf("score = %fnn",student1.score); /任务二 printf("num = %dn",p->num); printf("name

3、 = %sn",p->name); printf("score = %fnn",p->score); /任务三 return 0;9.8 设计一个能够描述上网网址的结构类型 struct web。它包含缩略名、全名、URL，然后构造对应的结构数组，编程输入你常用的数组、缩略名、全名，并且按照缩略名排序，当输入一个缩略名时，能够快速的找到对应的网址。#include <stdio.h>#include <string.h>#define MAX 5struct Web char abbr10; char name20; char

4、url60;int main(void) struct Web websMAX; int i; for (i = 0; i < MAX; i+) printf("please input 'abbr' 'name' 'URL' of %dth web:n",i+1); scanf("%s %s %s",websi.abbr, , websi.url); / initialise array webs struct Web tmp; int flag = 1; int j; for

5、(i = 0; i < MAX-1 && flag = 1; i+) flag = 0; for (j = 0; j < MAX-1-i; j+) if (strcmp(websj.abbr, websj+1.abbr) > 0) flag = 1; tmp = websj; websj = websj+1; websj+1 = tmp; / sort webs (Bubble Sort) char aim10; printf("please input abbr of the aim:n"); scanf("%s",a

6、im); int low = 0; int high = MAX - 1; int middle = 0; while (low <= high) middle = (low + high) / 2; if (strcmp(websmiddle.abbr, aim) > 0) high = middle - 1; else if (strcmp(websmiddle.abbr, aim) < 0) low = middle + 1; else if (strcmp(websmiddle.abbr, aim) = 0) break; if (strcmp(websmiddle.

7、abbr, aim) = 0) printf("the URL of %s is %s.n", , websmiddle.url); else printf("there is no such web!n"); / search web (Binary Search) return 0;9.11 将9.10题中的字段结构变量和一个整形变量定义成一个联合类型。通过键盘输入一个整数，对字段结构成员进行初始化，再将高字节和次高字节，以及低字节和次低字节之间数据交换，然后从该整形变量高字节开始，依次取出每个字节的高4位和低4位并以其

8、依次取出每个字节的高4位和低4位并以其作为十六进制值，再以该值的ASCII码形式进行显示。 #include <stdio.h>#include <string.h>struct w32 unsigned int b1 : 4; unsigned int b2 : 4; unsigned int b3 : 4; unsigned int b4 : 4; unsigned int b5 : 4; unsigned int b6 : 4; unsigned int b7 : 4; unsigned int b8 : 4;union W32 int num; struct w

9、32 bits4;int main(void) union W32 w; printf("Please input a number:"); scanf("%d",&w.num); /从键盘读入一个整数来进行初始化 unsigned int tmp; tmp = w.bits4.b1; w.bits4.b1 = w.bits4.b3; w.bits4.b3 = tmp; tmp = w.bits4.b2; w.bits4.b2 = w.bits4.b4; w.bits4.b4 = tmp; /将低字节和次低字节之间数据交换 tmp = w.bit

10、s4.b5; w.bits4.b5 = w.bits4.b7; w.bits4.b7 = tmp; tmp = w.bits4.b6; w.bits4.b6 = w.bits4.b8; w.bits4.b8 = tmp; /将高字节和次高字节之间数据交换 int c8; c0 = w.bits4.b1; c1 = w.bits4.b2; c2 = w.bits4.b3; c3 = w.bits4.b4; c4 = w.bits4.b5; c5 = w.bits4.b6; c6 = w.bits4.b7; c7 = w.bits4.b8;/将各个值存于数组便于操作 int i; for (i=0

11、; i<8; i+) if (ci > 9) ci += 'A' - 10; elseci += 1 - 1; /以其作为16进制值 for (i=7; i>=0; i-) printf("%dt", ci); if (i % 2 = 0) printf("n"); /以该值的ASCII码形式进行显示 return 0;10.2 利用文件的重定向，重做第10.1题。#include <stdio.h>int main(void) freopen("c:abc.dat", "w&q

12、uot;, stdout); char c80; int i; for (i=1; (gets(c) != NULL; i+) printf("%d %sn", i, c); fclose(stdout); return 0;10.4 编写一个程序cpy_cat，它将命令行指定的多个文件复制连接到一个新文件中。#include <stdio.h>#include <stdlib.h>int main(int argc, char *argv) char ch80; if (argc < 3) printf("Arguments Error.n"); exit(-1); freopen(argvargc-1, "w", stdout); int i; for (i=1; i < argc-