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function TryStrToInt(const s: string; out i : integer): boolean;
Converts a string to an integer, returns False if string does not represent a valid number.
var syold : string;
iyold : integer;
syold := InputBox('Birth Year',
'Please enter birth year', '1973'))
if TryStrToInt(syold, iyold) then
ShowMessage('You are now ' +
IntToStr(2003 - iyold) +
'years old!')
else
ShowMessage('Please enter a number');
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StrToInt,
IntToStr,
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