C rewind()

The rewind() function sets the file pointer at the beginning of the stream. It is useful if you have to use stream many times.

Syntax:

snippet
void rewind(FILE *stream)

Example:

File: file.txt

snippet
this is a simple text

File: rewind.c

snippet
#include
#include
void main(){
FILE *fp;
char c;
clrscr();
fp=fopen("file.txt","r");

while((c=fgetc(fp))!=EOF){
printf("%c",c);
}

rewind(fp);//moves the file pointer at beginning of the file

while((c=fgetc(fp))!=EOF){
printf("%c",c);
}

fclose(fp);  
getch();  
}

Output:

Output
this is a simple textthis is a simple text

As you can see, rewind() function moves the file pointer at beginning of the file that is why "this is simple text" is printed 2 times. If you don't call rewind() function, "this is simple text" will be printed only once.

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