将文件指针重新指向一个流的开头

[c]代码库

#include <stdio.h> 
#include <dir.h> 

 int main(void) 
 { 
    FILE *fp; 
    char *fname = "TXXXXXX", *newname, first; 

    newname = mktemp(fname); 
    fp = fopen(newname,"w+"); 
    fprintf(fp,"abcdefghijklmnopqrstuvwxyz"); 
    rewind(fp); 
    fscanf(fp,"%c",&first); 
    printf("The first character is: %c\n",first); 
    fclose(fp); 
    remove(newname); 

    return 0; 
}