程序代码：

#include<stdio.h>
#include<stdlib.h>
int main(void)
{
    FILE *out,*fp;
    char c;
    if((fp=fopen("test.txt","w"))==NULL)
    {
        printf("can't open the file.\n");
        exit(0);
    }
    while((c=getchar())!='#')
        fputc(c,fp);
    rewind(fp);
    if((out=fopen("out.txt","w"))==NULL)
            {
            printf("can't open the file.\n");
            exit(0);
            }
    while((c=fgetc(fp))!=EOF)
        fputc(c,out);
    fclose(fp);
    fclose(out);
}

程序代码：

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int main(void)
{
    FILE *fp;
    char a[][20]={"apple","grade","pear"},strout[20]="";
    int i;
    if((fp=fopen("f.txt","w"))==NULL)
    {
        printf("File open error!\n");
        exit(-1);
    }
    for(i=0;i<3;i++)
        fputs(a[i],fp);
    fclose(fp);//为什么这里要关闭一次  才可以？如果不关闭  直接用rewind就会出现我上面那个问题 
    if((fp=fopen("f.txt","r"))==NULL)
    {
        printf("File open error.\n");
        exit(-1);
    }
    i=0;
    while(!feof(fp))
    {
        if(fgets(strout,strlen(a[i++])+1,fp)!=NULL)
            puts(strout);
    }
    fclose(fp);
    return 0;
}请大家帮帮忙  谢谢了