这个 Pascal 语法有什么问题? [英] What's wrong with this Pascal syntax?

问题描述

我无法理解这里发生了什么.你能帮我个忙吗?这是有问题的代码:

I can't understand what's going on here. Can you give me a hand? This is the problematic code:

While not EOF(Archi) do begin
  index:= index + 1;
  Read(Archi, Alumno[index]);
  Promes[index] := (Alumno[index].nota1 + Alumno[index].nota2) / 2;
  if Promes[index] >= 6 then begin
     alguPromo := true;
     PromosIndex := PromosIndex + 1;
     Promos[PromosIndex]:= Alumno[index];
  end;
  else begin
       if Promes[index] > 4 then cantiRecu:= cantiRecu + 1;
       else begin
            LibresIndex += 1;
            Libres[LibresIndex] := Alumno[index];
            end;
  end;
end;

编译器在此代码的第 10 行中标记错误(否则开始).错误是:致命:语法错误，;预期但其他发现.

The compiler marks error in the line 10 of this code (else begin). The error is: Fatal: Syntax error, ; expected but ELSE found.

如果有人想托盘编译这里是完整的代码:http://pastebin.com/dRg1Lguu

If someone wants to tray compile here is the entire code: http://pastebin.com/dRg1Lguu

推荐答案

请注意，在 Pascal 中，分号是 分隔符，而不是 终止符.有时这无关紧要，但在某些情况下确实如此，尤其是在 else 之前.您的代码应该是:

Note that in Pascal the semicolon is a separator, not a terminator. Sometimes this doesn't matter, but in some cases it does, particularly before an else. Your code should be:

while not EOF(Archi) do
  begin
    index:= index + 1;
    Read(Archi, Alumno[index]);
    Promes[index] := (Alumno[index].nota1 + Alumno[index].nota2) / 2;
    if Promes[index] >= 6 then
      begin
        alguPromo := true;
        PromosIndex := PromosIndex + 1;
        Promos[PromosIndex] := Alumno[index]
      end
    else
      begin
        if Promes[index] > 4 then
          cantiRecu:= cantiRecu + 1
        else
          begin
            LibresIndex := LibresIndex + 1;
            Libres[LibresIndex] := Alumno[index]
          end
      end
  end

请注意，我已将代码重新格式化为更传统的样式，这有助于使程序逻辑更易于理解，并且也使分号需要和不需要分号的位置更加明显.

Note that I have re-formatted the code into a more conventional style which helps to make the program logic more easily understood and which also makes it more obvious where the semicolons are needed and where they are not.

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