如何检查数组是否包含特定值？ [英] How do I check whether an array contains a particular value?

问题描述

我该怎么正确写呢？：

If number is different from Array[1] to Array[x-1] the begin...... 

其中number是整数，而array是整数数组从1到x

where number is an integer and array is an array of integers from 1 to x

推荐答案

我相信如果数字 MyArray 中找不到>。然后，您可以这样操作：

I believe you want to do something if number is not found in the array MyArray. Then you can do it like this:

NoMatch := true;
for i := Low(MyArray) to High(MyArray) do
  if MyArray[i] = number then
  begin
    NoMatch := false;
    break;
   end;

if NoMatch then
  DoYourThing;

您可以创建一个检查在数组中是否找到数字的函数。然后，您每次需要执行此类检查时都可以使用此功能。而且每次，代码都将更具可读性。例如，您可以这样操作：

You could create a function that checks if a number is found in an array. Then you can use this function every time you need to perform such a check. And each time, the code will be more readable. For example, you could do it like this:

function IsNumberInArray(const ANumber: integer; 
  const AArray: array of integer): boolean;
var
  i: integer;
begin
  for i := Low(AArray) to High(AArray) do
    if ANumber = AArray[i] then
      Exit(true);
  result := false;
end;

...

if not IsNumberInArray(number, MyArray) then
  DoYourThing;

如果使用旧版的Delphi，则必须替换 Exit（真）通过开始结果：= true;打破;结束。我想在较新版本的Delphi中，您还可以玩通用之类的东西。

If you use a old version of Delp you have to replace Exit(true) by begin result := true; break; end. In newer versions of Delp I suppose you could also play with stuff like generics.

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