1_pro.c

C源代码 计算机等级考试C语言上机题

#include  <stdio.h>
#include  <string.h>
#include<conio.h>
char xx[20][80];
void jsSort()
{
  int i,j,k,strl,half;
  char ch;
  for(i=0;i<20;i++)
  {
    strl=strlen(xx[i]);         /*求各行字符串的总长度*/
    half=strl/2;                 /*求总长度的一半*/
    for(j=0;j<half-1;j++)   
      for(k=j+1;k<half;k++)
        if(xx[i][j]<xx[i][k])
          { ch=xx[i][j]; xx[i][j]=xx[i][k]; xx[i][k]=ch; }
    if(strl%2)                    /*如果原字符串长度为奇数，则最中间的字符不参加排序*/
    half++;
    for(j=half;j<strl-1;j++)    /*右边部分按字符的ASCII值升序排序*/ 
      for(k=j+1;k<strl;k++)
        if(xx[i][j]>xx[i][k])
          { ch=xx[i][j]; xx[i][j]=xx[i][k]; xx[i][k]=ch; }
  }
}
void main()
{
  readDat();
  jsSort();
  writeDat();
}
readDat()
{
  FILE *in;
  int i=0;
  char *p;
  in=fopen("IN79.DAT","r");
  while (i<20 && fgets(xx[i],80,in)!=NULL)
  {
    p=strchr(xx[i],'\n');
    if(p) 
    *p=0;
    i++;
  }
  fclose(in);
}
writeDat()
{
  FILE *out;
  int i;
  clrscr();
  out=fopen("OUT79.DAT","w");
  for(i=0;i<20;i++) 
  { printf("%s\n",xx[i]); fprintf(out,"%s\n",xx[i]); }
  fclose(out);
}