Description
The C library function void rewind(FILE *stream) sets the file position to the beginning of the file of the given stream.
Declaration
Following is the declaration for rewind() function.
void rewind(FILE *stream)
Parameters
-
stream − This is the pointer to a FILE object that identifies the stream.
Return Value
This function does not return any value.
Example
The following example shows the usage of rewind() function.
#include <stdio.h>
int main()
{
char str[] = "This is tutorialspoint.com";
FILE *fp;
int ch;
/* First let's write some content in the file */
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);
}
//set the file position to the beginning, if it doesn't have this function, fp will point NULL ,because above while(1) and break when feof(fp) is true.
rewind(fp);
printf("
");
while(1)
{
ch = fgetc(fp);
if( feof(fp) )
{
break ;
}
printf("%c", ch);
}
fclose(fp);
return(0);
}
Let us assume we have a text file file.txt that have the following content −
This is tutorialspoint.com
Now let us compile and run the above program to produce the following result −
This is tutorialspoint.com This is tutorialspoint.com