string to integer conversion in Pascal, How to do it?

How to convert a number printed in a string into integer?

Thank you.

This is the procedure Val:

procedure Val(S; var V; var Code: Integer);

This procedure operates on integer and real numbers.

Parameters:

• S char sequence; for proper conversion, it has to contain only characters from the set +-,.0123456789.
• V The result of conversion, if conversion succeeds. If the result is going to be an Integer, then S can't contain , or ..
• Code Returns the position in S of the character that interrupted the conversion, if conversion does not succeed.

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