ch27-15.c

C语言程序设计上机指导与练习 冶金工业出版社 刘怀亮

#include <stdio.h>
#include <string.h>
#include <conio.h>

char xx[5][80];

void jsSort()
{
   int i,j,k,strl,half;
   char temp;
   for(i=0;i<5;i++)
   {
      strl=strlen(xx[i]);
      half=strl/2;
      for(j=0;j<half-1;j++)
        for(k=j+1;k<half;k++)
          if(xx[i][j]<xx[i][k])
            { temp=xx[i][j]; xx[i][j]=xx[i][k]; xx[i][k]=temp;}
      for(j=half-1,k=strl-1;j>=0;j--,k--)
      { temp=xx[i][j]; xx[i][j]=xx[i][k]; xx[i][k]=temp;}
   }
}
void readDat()
{
   int i=0;
   printf("\nPlease input the text.\n");
   scanf("%s",xx[i]);
   while(i<5)
   {
      gets(xx[i]);
      i++;
   }
}
void writeDat()
{
   FILE *out;
   int i;
   clrscr();
   out=fopen("out.dat","w");
   for(i=0;i<20;i++){
      printf("%s\n",xx[i]);
      fprintf(out,"%s\n",xx[i]);
   }
   fclose(out);
}
void main()
{
   readDat();
   jsSort();
   writeDat();
}