C library functions - rewind ()

C standard library - <stdio.h>

description

C library functionsvoid rewind (FILE * stream) at the beginning of the file location set for a given flow streamfiles.

statement

Here is the rewind () function's declaration.

void rewind(FILE *stream)

parameter

• stream - This is a pointer to FILE pointer to an object, the object identifier FILE flow.

return value

This function does not return a value.

Examples

The following example demonstrates rewind () function is used.

#include <stdio.h>

int main()
{
   char str[] = "This is w3cschool.cc";
   FILE *fp;
   int ch;

   /* 首先让我们在文件中写入一些内容 */
   fp = fopen( "file.txt" , "w" );
   fwrite(str , 1 , sizeof(str) , fp );
   fclose(fp);

   fp = fopen( "file.txt" , "r" );
   while(1)
   {
      ch = fgetc(fp);
      if( feof(fp) )
      {
          break ;
      }
      printf("%c", ch);
   }
   rewind(fp);
   printf("\n");
   while(1)
   {
      ch = fgetc(fp);
      if( feof(fp) )
      {
          break ;
      }
      printf("%c", ch);
     
   }
   fclose(fp);

   return(0);
}

Suppose we have a text filefile.txt, which reads as follows:

This is w3cschool.cc

Let's compile and run the above program, which will result in the following:

This is w3cschool.cc
This is w3cschool.cc

C standard library - <stdio.h>