C语言程序编程设计。

Question

Answer 1

void main()
{
  FILE *fp = fopen("test.txt","w");
  if(fp == NULL)
  {
      printf("文件打开失败。");
      return;
  }
  char ch = getchar();
  while(ch != '!')
  {
    if(ch >= 'a' && ch <= 'z')
        ch += 'A' - 'a';
    fputc(ch,fp);
    ch = getchar();
  }
  fclose(fp);
}