StrToInt
Convert a string to an integer value.
Declaration
Source position: sysstrh.inc line 131
function StrToInt(const s: string) : LongInt;
Description
StrToInt will convert the string Sto an integer. If the string contains invalid characters or has an invalid format, then an EConvertError is raised.
To be successfully converted, a string can contain a combination of numerical characters, possibly preceded by a minus sign (-). Spaces are not allowed.
The string S can contain a number in decimal, hexadecimal, binary or octal format, as described in the language reference. For enumerated values, the string must be the name of the enumerated value. The name is searched case insensitively.
For hexadecimal values, the prefix '0x' or 'x' (case insensitive) may be used as well.
Errors
In case of error, an EConvertError is raised.
See also
| Name | Description |
|---|---|
| EConvertError | Conversion error. |
| IntToStr | Convert an integer value to a decimal string. |
| StrToIntDef | Convert a string to an integer value, with a default value. |
Example
Program Example82;
{$mode objfpc}
{ This program demonstrates the StrToInt function }
Uses sysutils;
Begin
Writeln (StrToInt('1234'));
Writeln (StrToInt('-1234'));
Writeln (StrToInt('0'));
Try
Writeln (StrToInt('12345678901234567890'));
except
On E : EConvertError do
Writeln ('Invalid number encountered');
end;
End.