string to integer conversion in Pascal, How to do it?
Ho开发者_开发知识库w to convert a number printed in a string into integer?
Thank you.
The is procedure Val:
procedure Val(S; var V; var Code: Integer);
This procedure operate on decimal and real numbers.
Parmeters:
- S char sequence; for proper conversion it has to contain ‘+’, ‘-‘, ‘,’, ’.’, ’0’..’9’.
- V The result of conversion. If result going to be an Integer then S can't contain ‘,’, ’.’.
- C Return the position of the character from S, that interrupt the conversion.
Use cases:
Var Value :Integer;
Val('1234', Value, Code); // Value = 1234, Code = 0
Val('1.234', Value, Code); // Value = 0, Code = 2
Val('abcd', Value, Code); // Value = 0, Code = 1
You can use Val function.
Example:
var
sNum: String;
iNum: Integer;
code: Integer;
begin
s := '101';
Val(s, iNum, code);
end.
You want Val()
.
You can use like this,
var
i: integer;
s: string;
begin
str(i, s);
write(i);
Textval := '123';
Val(Textval, Number, Code) ---> Code = 0, Number = 123
Textval := '12345x2';
Val( Textval, Number, Code) ---> Code = 6, Number remains unchanged;
Val( TextVal, Number , Code) which converts String to a number. if possible the result of code = 0, elese error indication number.
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