c - 获取用户输入并在需要时停止循环 C

Question

我需要从用户那里获取给定范围内的输入整数。我需要得到他们的低点和高点。但循环并没有停止，我不知道为什么。我以为我的条件很好，但循环不会停止。

int     obtainNumberBetween (const char* descriptionCPtr, int low, int high) {
  char  line[MAX_LINE];
  int   entry;
//  #define     MAX_LINE    256

  // YOUR CODE HERE
 do
  {
    printf("Please enter the lowest number in the range (%d-%d):\n " ,RANGE_LOWEST ,RANGE_HIGHEST);
    fgets(line, 256, stdin);
    low = atoi(line);
    printf ("The value entered is %d\n", low);

  }
  while  ( (entry < low) || (entry > high) );

return(entry);

}

应有的示例输出:

Please enter the lowest number in the range (0-32767): -6
Please enter the lowest number in the range (0-32767): 1
Please enter the highest number in the range (1-32767): 0
Please enter the highest number in the range (1-32767): 32768
Please enter the highest number in the range (1-32767): 512

Answer 1

您的entry变量未初始化。所以这一行调用了一个未定义的行为:

while  ( (entry < low) || (entry > high) )

也许您应该将用户输入分配给条目，而不是low。