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Copy Variable

 
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rikotech8



Joined: 10 Dec 2011
Posts: 376
Location: Sofiq,Bulgariq

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Copy Variable
PostPosted: Sat Mar 17, 2012 2:18 am     Reply with quote
How to insert a variable from one function to another?
For example:
Code:


func(1){
var_name=10;
var_name+=10;
printf("var_name = %d", var_name);
}

void main(){
unsigned int8 var_name;

while (1){
 func(1);
 }
}

How could I print variable declared in main function, to another one?

Thx in advance!
Ttelmah



Joined: 11 Mar 2010
Posts: 19515

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PostPosted: Sat Mar 17, 2012 2:44 am     Reply with quote
Basic C. I'd suggest you get a C primer....

Code:

void func(unsigned int8 ival){
//This says 'func', is a function returning nothing (hence 'void', but
//expecting to receive an unsigned int8, which it will refer to internally
//as ival
    ival+=10; //Add ten to the value passed
    printf("main val+10 = %d\n\r", ival);
}

void main(void){
    unsigned int8 int_var; //Call your variables with names that help
    //you remember 'what' they can hold
   
    int_var=20;
    while (1){
      func(int_var);
   }
}

Which will print "main val+10 = 30" taking the value passed _to_ it from main, adding ten, and then printing it.
You need to read a basic book on C, since you can then return a value as well (which can be different), or use global variables (study the dangers of these). This is basic 'programming 101' stuff, not really what this forum is for.

Best Wishes
rikotech8



Joined: 10 Dec 2011
Posts: 376
Location: Sofiq,Bulgariq

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PostPosted: Sat Mar 17, 2012 4:48 am     Reply with quote
If you give me, some links with this book would be great!
dyeatman



Joined: 06 Sep 2003
Posts: 1934
Location: Norman, OK

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PostPosted: Sat Mar 17, 2012 5:01 am     Reply with quote
http://www.ccsinfo.com/content.php?page=books

The C Programing Language is the "bible" for C programming.
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Ttelmah



Joined: 11 Mar 2010
Posts: 19515

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PostPosted: Sat Mar 17, 2012 9:40 am     Reply with quote
Seriously, by a primer, I meant a primer. The C programming language, is pretty much written for programmers, and though the book everyone should have, I really would suggest starting with a basic C primer. A Google search will find dozens.

Best Wishes
gpsmikey



Joined: 16 Nov 2010
Posts: 588
Location: Kirkland, WA

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PostPosted: Sat Mar 17, 2012 11:31 am     Reply with quote
While K&R "The C Programming Language" is the "bible", it can also cure insomnia Shocked Browse through the books at places like Amazon.com and look at the user comments - what works for one person may not for another, but there are some excellent intro books out there - definitely worth the investment.
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mikey
-- you can't have too many gadgets or too much disk space !
old engineering saying: 1+1 = 3 for sufficiently large values of 1 or small values of 3
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