procedure help
Author 
Message 
Schaef

Posted: Tue Jan 20, 2004 7:13 am Post subject: procedure help 


I was just wondering in a procedure what the things in the bracket are after proc and the name of the procedure and why the variables do not need to be assigned values






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CjGaughan

Posted: Tue Jan 20, 2004 10:38 am Post subject: (No subject) 


SUBPROGRAMS
A part of a program (a subprogram) can be given a name. There are two kinds of subprograms:
1) Functions
2) Procedures
There are subprograms that are predefined (provided as part of the Turing language).
These include:
sqrt  a predefined function that gives the square root of a number.
randint  a predefined procedure that generates random integers
A function takes a value, such as 3, and produces a result, such as 9. In this example, the function produces the square of the number it receives; so when it receives 3 it produces 3**2 = 9
example:
function square (x : real) : real
result x**2
end square
for i : 1 .. 5
put i : 2, square (i) : 4
end for
We say that the square function is called and that actual parameter i is passed to formal parameter x.
AN EXAMPLE FUNCTION
The function shown here takes a name such as "fred jones" and produces a result string with the last name first : "Jones, Fred"
basically, the part in the brackets is the kind of variable that will be used for input.
here is an example code (calculates area of a circle):
code:  const pi := 3.141592654
function circleArea (rad : real) : real
var area : real
area := pi * rad ** 2
result area
end circleArea
var r : real
put "Enter the radius of the circle: " ..
get r
put "The area of that circle is: ", circleArea (r) : 5 : 2
var choice : string
put "" 
dont know if this helps...but oh well







