test.c

编译原理的词法分析器

Function name: fread
Function: read a data from the datastream
Usage: int fread(void *ptr, int size, int nitems, FILE *stream);
Example: 

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

int main(void)
{
   FILE *stream;
   char msg[] = "this is a test";
   char buf[20]; 

   if ((stream = fopen("DUMMY.FIL", "w+")) == NULL)
   {
      fprintf(stderr, "Cannot open output file.\n");
      return 1;
   } 

   fwrite(msg, strlen(msg)+1, 1, stream); 

   fseek(stream, SEEK_SET, 0); 

   fread(buf, strlen(msg)+1, 1, stream);
   printf("%s\n", buf); 

   fclose(stream);
   return 0;
}