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,strl,half,j,k;
  char ch;
  for(i=0;i<20;i++)             /*行循环*/
  {
    strl=strlen(xx[i]);         /*每行长度*/
    half=strl/2;
    for(j=0;j<half-1;j++)       /*每行的第j个位置*/
      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;}
    for(j=half-1,k=strl-1;j>=0;j--,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("IN78.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("OUT78.DAT","w");
  for(i=0;i<20;i++)
  { printf("%s\n",xx[i]); fprintf(out,"%s\n",xx[i]); }
  fclose(out);
}