这是我的程序。没有编译器消息,但在运行时它退出。有人可以帮我吗?好像出了什么问题?
问题是在我创建文件后开始的
t
,所以也许有一些我看不到的东西。预先感谢。
program MyProgr;
var
F: text;
t: Textfile;
a, count: array of Integer;
b: Integer;
i, int: Integer;
countnums: Integer;
n, m: String;
lin, nums: Integer;
Small, Big: Integer;
procedure DoWhatEver(S: string);
begin
val(S, int);
Write(S, ' ');
for i := Small to Big do
if (a[i] = int) then
count[i] := count[i] + 1;
end;
procedure FilltheArray;
begin
for i := Small to Big do
a[i] := i + 1;
end;
procedure ProcessString;
var
Strng, S: string;
Last, P: Integer;
begin
readln(F, Strng);
Last := 0;
while Last < length(Strng) do
begin
P := Last + 1;
while (P <= length(Strng)) and (Strng[P] <> ' ') do
inc(P);
S := copy(Strng, Last + 1, (P - Last - 1));
DoWhatEver(S);
Last := P;
end
end;
procedure ProcessStringA;
var
Strng: string;
Last, P: Integer;
begin
readln(F, Strng);
Last := 0;
while Last < length(Strng) do
begin
P := Last + 1;
while (P <= length(Strng)) and (Strng[P] <> ' ') do
inc(P);
n := copy(Strng, Last + 1, (P - Last - 1));
val(n, nums);
Last := P;
end
end;
procedure ProcessStringB;
var
Strng: string;
Last, P: Integer;
begin
readln(F, Strng);
Last := 0;
while Last < length(Strng) do
begin
P := Last + 1;
while (P <= length(Strng)) and (Strng[P] <> ' ') do
inc(P);
m := copy(Strng, Last + 1, (P - Last - 1));
val(m, lin);
Last := P;
end
end;
begin
assign(F, 'myfile.txt');
reset(F);
ProcessStringA;
Writeln(nums);
ProcessStringB;
Writeln(lin);
setlength(a, nums);
Small := Low(a);
Big := High(a);
for i := Small to Big do
count[i] := 0;
FilltheArray;
while not eof(F) do
ProcessString;
for i := Small to Big do
begin
if count[i] = 2 then
countnums := countnums + 1;
end;
Close(F);
assign(t, 'fileout.txt');
Rewrite(t);
Writeln(t, countnums);
Close(t);
end.
问题是您声明了两个动态数组(
count
和a
)。
a, count: array of Integer;
此时它们都没有分配内存。
然后为
a
分配内存,并获取 a
的低索引和高索引:
setlength(a, nums);
Small := Low(a);
Big := High(a);
然后循环遍历
count
数组中的这些索引,该数组尚未分配内存(您在 SetLength
上调用 a
):
for i := Small to Big do
count[i] := 0;
访问尚未分配的内存会生成
Runtime error 216
,这是一种访问冲突(在 Delphi 中,如果启用了异常,则会引发 EAccessViolation
)或一般保护错误(在 FreePascal 中)。