rewind

函數名:rewind

功能:將文件內部的位置指針重新指向一個流（數據流/文件）的開頭

注意：不是文件指針而是文件內部的位置指針，隨著對文件的讀寫文件的位置指針（指向當前讀寫位元組）向後移動。而文件指針是指向整個文件，如果不重新賦值文件指針不會改變。

rewind函數作用等同於(void)fseek(stream,0L,SEEK_SET);

用法:void rewind(FILE*stream);

頭文件：stdio.h

返回值：無

A statement such as

rewind(cfptr);

causes a program's file position--which indicates the number of the next byte in the file to be read or written-- to be repositioned to the beginnning of the file pointed to by cfptr.

#include

#include

int main(void)

{

FILE*fp;

char fname="TXXXXXX",*newname,first;

newname=mktemp(fname);

fp=fopen(newname,"w+");

if(NULL==fp)

return 1;

fprintf(fp,"abcdefghijklmnopqrstuvwxyz");

rewind(fp);

fscanf(fp,"%c",&first);

printf("The first character is:%c\n",first);

fclose(fp);

remove(newname);

return 0;

}