#include<stdio.h>
#include<stdlib.h>
#include<stdbool.h>

#define LENGTH 80

int main()
{
  char *proverbs[]=
       {"Many a mickle makes a muckle.\n",
        "Too many cooks spoil the broth.\n",
        "He who laughs last didn't get the joke in"
        "the first place.\n"
       };
  char more[LENGTH];
  FILE *pfile=NULL;
  char *filename="C:\\myfile.txt";

  if(!(pfile=fopen(filename,"w")))
  {
    printf("Enter opening %s for writing.Program terminated.",filename);
    exit(1);
  }

  int count=sizeof proverbs/sizeof proverbs[0];      这句是什么意思，看不懂这句话在这里的用意。
  for(int i=0;i<count;i++)
    fputs(proverbs[i],pfile);

  fclose(pfile);

  if(!(pfile=fopen(filename,"a")))
  {
    printf("Enter opening %s for writing.Program terminated.",filename);
    exit(1);
  }

  printf("Enter proverbs of less than 80 character or press Enter to end:\n");
  while(true)                    这句话在这里是不是有点多余了，上面的if语句不是已经判断过了吗？
  {
    fgets(more,LENGTH,stdin);

    if(more[0]=='\n')
     break;
    fputs(more,pfile);
  }

  fcolse(pfile);

  if(!(pfile=fopen(filename,"r")))
  {
    printf("Enter opening %s for writing.Program terminated.",filename);
    exit(1);
  }

  printf("The proverbs in the file are:\n\n");
  while(fgets(more,LENGTH,pfile))
   printf("%s",more);

  fclose(pfile);
  remove(filename);
  return 0;
}

上面的while(true)是对什么判断的，它是当什么为真时，就执行下面的语句。

还不是太懂，是什么为真，能再说明白点吗？谢谢

while(true)                    
  {
    fgets(more,LENGTH,stdin);

    if(more[0]=='\n')
     break;
    fputs(more,pfile);
  }

while(true)是对什么做出判断的，当什么为真时，才执行下面的语句啊！

明白了，谢谢