"05瓯信算面向对象实验"版本比较

05瓯信算面向对象实验

先打开实验报告模板，查看需要完成哪些题目，然后打开判题系统地址，在判题系统上做对相应题目，最后将正确的程序复制到实验报告中，发到邮箱。

判题系统地址：[http://wzuacm.3322.org/]

完成如下实验报告：

• attachment:面向对象实验1.doc 判题系统1、3题
• attachment:面向对象实验2.doc 判题系统5、7题
• attachment:面向对象实验3.doc 判题系统11题
• attachment:面向对象实验4.doc 判题系统11题

在实验报告文件名后添加你的学号姓名，比如“面向对象实验1-0530215288-张三.doc”，然后email到： czk.cpp@gmail.com

1. 实验3

1. 拷贝5.4节中的程序：

      1    #define ALLOCSIZE 10000 /* size of available space */
      2 
      3    static char allocbuf[ALLOCSIZE]; /* storage for alloc */
      4    static char *allocp = allocbuf;  /* next free position */
      5 
      6    char *alloc(int n)    /* return pointer to n characters */
      7    {
      8        if (allocbuf + ALLOCSIZE - allocp >= n) {  /* it fits */
      9            allocp += n;
     10            return allocp - n; /* old p */
     11        } else      /* not enough room */
     12            return 0;
     13    }
     14 
     15    void afree(char *p)  /* free storage pointed to by p */
     16    {
     17        if (p >= allocbuf && p < allocbuf + ALLOCSIZE)
     18            allocp = p;
     19    }
   

   或者可以将后面出现的alloc函数调用改成malloc函数调用

2. 1.9节getline

      1   /* getline:  read a line into s, return length  */
      2    int getline(char s[],int lim)
      3    {
      4        int c, i;
      5 
      6        for (i=0; i < lim-1 && (c=getchar())!=EOF && c!='\n'; ++i)
      7            s[i] = c;
      8        if (c == '\n') {
      9            s[i] = c;
     10            ++i;
     11        }
     12        s[i] = '\0';
     13        return i;
     14    }
   

3. 5.6节

      1    #include <stdio.h>
      2    #include <string.h>
      3 
      4    #define MAXLINES 5000     /* max #lines to be sorted */
      5 
      6    char *lineptr[MAXLINES];  /* pointers to text lines */
      7 
      8    int readlines(char *lineptr[], int nlines);
      9    void writelines(char *lineptr[], int nlines);
     10 
     11    void qsort(char *lineptr[], int left, int right);
     12 
     13    /* sort input lines */
     14    main()
     15    {
     16        int nlines;     /* number of input lines read */
     17 
     18        if ((nlines = readlines(lineptr, MAXLINES)) >= 0) {
     19            qsort(lineptr, 0, nlines-1);
     20            writelines(lineptr, nlines);
     21            return 0;
     22        } else {
     23            printf("error: input too big to sort\n");
     24            return 1;
     25        }
     26    }
     27 
     28    #define MAXLEN 1000  /* max length of any input line */
     29    int getline(char *, int);
     30    char *alloc(int);
     31 
     32    /* readlines:  read input lines */
     33    int readlines(char *lineptr[], int maxlines)
     34    {
     35        int len, nlines;
     36        char *p, line[MAXLEN];
     37 
     38        nlines = 0;
     39        while ((len = getline(line, MAXLEN)) > 0)
     40            if (nlines >= maxlines || (p = alloc(len)) == NULL)
     41                return -1;
     42            else {
     43                line[len-1] = '\0';  /* delete newline */
     44                strcpy(p, line);
     45                lineptr[nlines++] = p;
     46            }
     47        return nlines;
     48    }
     49 
     50    /* writelines:  write output lines */
     51    void writelines(char *lineptr[], int nlines)
     52    {
     53        int i;
     54 
     55        for (i = 0; i < nlines; i++)
     56            printf("%s\n", lineptr[i]);
     57    }
   

   及qsort和swap

   void qsort(char *v[], int left, int right)
   {
       int i, last;
       void swap(char *v[], int i, int j);
   
       if (left >= right)  /* do nothing if array contains */
           return;         /* fewer than two elements */
       swap(v, left, (left + right)/2);
       last = left;
       for (i = left+1; i <= right; i++)
           if (strcmp(v[i], v[left]) < 0)
               swap(v, ++last, i);
       swap(v, left, last);
       qsort(v, left, last-1);
       qsort(v, last+1, right);
   }
   /* swap:  interchange v[i] and v[j] */
   void swap(char *v[], int i, int j)
   {
       char *temp;
   
       temp = v[i];
       v[i] = v[j];
       v[j] = temp;
   }

4. 所有的qsort换一个名字，比如qsort2

5. 修改readlines函数

       while(scanf("%s", line)!=EOF) {
           len = strlen(line)+1;