从文件中逐个读取字符

#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
void main()
{


  FILE *fp;
  char ch;
  if((fp=fopen("string.txt","rt"))==NULL)
  {
    printf("Cannot open file strike any key exit!");
    getch();
    exit(0);
  }
  ch=fgetc(fp);
  while(ch!=fp);
  {
    putchar(ch);
    ch=fgetc(fp);
  }
  fclose(fp);
}