调试器异常错误和内存溢出 [英] Debugger Exception Error and memory overshoot

问题描述

我试图运行以下代码，但它显示了一个关于内存地址的错误，并显示一条消息，可能在循环后不定义。请看看。

  var n_max：integer; 
 n：整数; 
 r，R1，f，h0：Real的数组; 
 const 
 h = 0.00889; nip = 100; 
 cod = 10; 
 rod = 76; 
 nip_dia = 5;粘度= 0.001;速度= 76; 
 begin 
 n_max：= Round（（（rod-cod）/ 2）/ h）; 
 for n：= 0 to n_max-1 do; 
 r [n]：= cod / 2 + h * n; 
 R1 [n]：=（r [n] *（nip_dia）/ 2）/（r [n] +（nip_dia）/ 2）; 
 f [n]：= nip *（（r [n] -r [0]）/ r [n]）; 
 h0 [n]：= 4 *粘度*速度*（1 /（60 *（R1 [n] / f [n]）））; 
 
 
 WriteLn（r [n]）; 
 WriteLn（R1 [n]）; 
 WriteLn（f [n]）; 
 WriteLn（h0 [n]）; 
 
 ReadLn; 
结束。 
  

解决方案

您不会为数组分配任何内存。您需要调用 SetLength 来做到这一点。

  SetLength（r，n_max）; 
 //同样为其他数组
  

此外，循环什么都不做。该循环包含一个单独的语句，这是一个空的语句，在 do 之后由分号终止。

<$ p $对于n：= 0到n_max-1，p>
//是的，分号是循环结束


你会需要一个开始 / end block。

  for n：= 0 to n_max-1 do 
 begin 
 //循环体在这里
 .... 
 end; 
 //在这一点上，在循环之外，n的值是不明确的。 
  

I tried to run the following code but it shows an error regarding memory address and shows a message that 'n maybe undefined after the loop'. Please have a look.

var n_max : integer;
  n: integer;
  r, R1, f, h0 : Array of Real;
const
  h = 0.00889; nip= 100;
  cod = 10;
  rod = 76;
  nip_dia = 5; viscosity = 0.001; velocity = 76;
begin
  n_max := Round(((rod-cod)/2)/h);
   for n := 0 to n_max-1 do;
    r[n]:= cod/2 + h*n;
    R1[n] := (r[n]*(nip_dia)/2)/(r[n]+(nip_dia)/2);
    f[n] := nip*((r[n]-r[0])/r[n]);
    h0[n] :=4*viscosity*velocity*(1/(60*(R1[n]/f[n])));


WriteLn(r[n]);
WriteLn(R1[n]);
WriteLn(f[n]);
WriteLn(h0[n]);

ReadLn;
end.

解决方案

You don't allocate any memory for the arrays. You need to call to SetLength to do that.

SetLength(r, n_max);
// and likewise for the other arrays

What's more, the loop does nothing. The loop contains a single statement which is an empty statement terminated by the semi-colon after the do.

for n := 0 to n_max-1 do;
// yes, that semi-colon is the end of the loop

You'll need a begin/end block.

for n := 0 to n_max-1 do
begin
  // loop body goes in here
  ....
end;
// at this point, outside the loop, the value of n is ill-defined. 

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