Computer Science Canada procedure help |
| Author: | Schaef [ 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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| Author: | CjGaughan [ Tue Jan 20, 2004 10:38 am ] | ||
| Post 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):
dont know if this helps...but oh well |
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