System

In Delphi code, Val converts the string value S to its numeric representation, as if it were read from a text file with Read. 

S is a string-type expression; it must be a sequence of characters that form a signed real number.  

V is an integer-type or real-type variable. If V is an integer-type variable, S must form a whole number.  

Code is a variable of type Integer. 

If the string is invalid, the index of the offending character is stored in Code; otherwise, Code is set to zero. For a null-terminated string, the error position returned in Code is one larger than the actual zero-based index of the character in error. 

Str