Changes between Version 16 and Version 17 of ResumedC

Timestamp:

May 13, 2009, 6:55:04 PM (16 years ago)

Author:

Thanatermesis

Comment:

--

ResumedC

@@ -101 +101 @@
 Everytime you enclose a variable declaration inside a block '''{}''', it is limited to this section (not works out of it), if you have variables declared out of any function and/or out of main(), it is supported by all the entire application. Also, if you declare a variable inside a block that is already declared outside of it, then for inside the block it is used only the new declared one, not the one declared out of it, however, this practice is not good since may be very confusing.
 
-'''Static''': By declaring a '''static''' variable (or function) out of any function (global mode), it will be used only in the actual file (not a real file, but more like a ''compilation unit''), this is good for a better optimization but if you want to use it in other ''files'', you need to declare it by '''extern'''. By other side, if you declare it in a block or a loop something like  ''static int foo = 5;''  you can do operations to this variable without worry about the declaration of the value 5, because when is in mode static, it is only declared to the selected value the first time, the next times that are called is ignored.
-
 '''signed''': means ''with sign'', so, values negative and positive, for example if the '''char''' variable has a limit of 255 values, using the '''sign''' mode we can use from '''-128''' (negative) to '''127''' (positive), and using '''unsigned''' we can use from '''0''' to '''255'''
+
+==== Extern ====
+You should '''ignore''' it since its the default when there's no anything set. It means that you can use and/or re-declare a function on other ''files'' of the code
+
+==== Static ====
+You can use ''static'' inside a function or outside it, it has two differents meanings:
+     * Inside a function: You can ''pre'' set a value to a variable ''(static int foo = 5)'', then the first time you enter on the function it will be set to 5, but the next times it not set again, it just remember the last value used
+     * Outside a function (global mode): You will use it only in the actual file (compilation unit), good for optimization but you can't use it on other files
 
 
@@ -151 +157 @@
 
 === Functions ===
-
-A basic function:
+A function can be (re)called too (inside himself), this is known as ''recursion''
+
+==== Basic example ====
 
 {{{
@@ -161 +168 @@
  This function means: it needs to return a ''float'' variable, it is called with two parameters of type float too, this function can't modify directly the variables (width or height), for that is needed to use pointers (because we have the address (of memory) to that data instead the data value, so we can modify its content (data))
 
+
+==== Structure of a function ====
+{{{
+#!C
+[class_of_memorization] [type] name( [arguments] )
+// class: It will be static or extern (see Variables section)
+// type: It will be anything (void, int, char, a pointer...), except an array
+// arguments: Arguments to pass to a function, if any
+}}}
+
+
+==== Modification of variables by pointers ====
 This is a example of a function call and modification by using pointers:
 {{{
@@ -173 +192 @@
 }}}
 
-A function can be (re)called too, this is known as ''recursion''
+
+==== Prototype of Functions ====
+When there's no arguments for the function, just use the void value
+
+When there's arguments, you should add too a name of variable after it, the mean of this is just to be more easy to understand when reading the headers file for example
+{{{
+#!C
+double calc( double base, double exponent);
+}}}
+
 
 
@@ -249 +277 @@
 }}}
 
-'''Double pointers''': The double pointer can be used for 2 differents things:
+==== Double pointers ====
+The double pointer can be used for 2 differents things:
  * A pointer that points to a pointer, so that you can change the value of the original pointer (address value)
    * ''To modify the value of a variable using pointers in a function, you need to pass the address of that variable'': Same thing when you try to modify the address of a pointer (pointer of a pointer)