13-6.c

本书是单片机系列教材

/*13-6.c*/
#include "stdio.h"
   #include"stdlib.h"
   #define N 1024
   main()
{ FILE *fp;
int i;
char ch;
char *fname;
printf ("Enter the all file name:");
scanf("%s",fname);
if((fp=fopen(fname,"rb+"))==NULL)
{printf("This %s file is not exist. \n",fname);
exit(0);
  }
  for (i=1;i<=N;i++)
{ ch=fgetc(fp);
fseek(fp,-1,1);
fputc(ch,fp);
}
fclose (fp);
}