Functions are just like procedures, but functions return a value. The values passed between the main program and the function must be the same data type. We have already used a function called UpperCase(). It took a string and returned the string with uppercase letters. Syntax:

function Function_Name(var):DataType;

example: 
function squared(var x:integer):integer;
begin
 squared := x * x;
end; This tutorial will create two functions. One function will square a number and the other will return the absolute value of a number. Less