Thread: Newbie question

Hi guys,

When a user defined fucntion returns a value, it goes to the fuction in the main right?. And that value has to be assigned to a variable right?.
for example:

Code:

void main()
{
ans=function();
}


int function()
{
int add;
add=1+3;
return add;
}

so if I want to use the value in the variable "ans". I would just call the function like this:

Code:

funtion();

or like this

Code:

funtion(ans);

thanks

No. If you call the function from main yes, if you call the function from another function than no.

Also main should be int not void

Code:

int main(void)
{
  return 0;
}

So your code should look like this

Code:

/* function prototype */
int function(void);

int main()
{
  int ans = 0;
  ans=function();
  return 0;
}

int function(void)
{
  int add;
  add = 1 + 3;
  return add;
}

Sorry if I am not clear

ok, so what I mean is that the value returned from the funtion() is in "ans" now right. So if I want to call the funtion anywhere in the program how will I get that value from the "ans". Do I just call the funtion like this function() or will have to to write ans in the front like this funtion(ans) so it know I want the value in "ans".


Thanks

Edit: Don't go to sleep now, I need your help hehe :P

Originally Posted by jat421

I meant that if I want the value in the varaible "ans" anywhere in the program how would I get that? Is it just if I call the funtion anywhere in the program it will give the value in the add?

That depends upon the scope of the variable. If the variable is defined within main() then that can be accessed only within main() but if its defined above main() and outside any function then that variable is available everywhere in the program. For eg.

Code:

int main(){
  int ans;
  ans = function();
  return 1;
}

int function(){
...something..
}

Here the variable 'ans' can be accessed anywhere in the main but not in function() as its local to main().

Code:

  int ans;
int main(){
  ans = function();
  return 1;
}

int function(){
...something..
}

Here 'ans' can be accessed by function() as well as its a global variable.

thanks for the reply rjv_rnjn

But that not what I am looking for. Sorry if I am not clear. Here I will try to rearrange my question.

ok, so what I mean is that the value returned from the funtion() is in "ans" now right. So if I want to call the funtion anywhere in the program how will I get that value from the "ans". Do I just call the funtion like this function() or will have to to write ans in the front like this funtion(ans) so it know I want the value in "ans".

thanks

Originally Posted by jat421

Do I just call the funtion like this function() or will have to to write ans in the front like this funtion(ans) so it know I want the value in "ans".

If you want the value returned from the function() to be stored in "ans" then you do

Code:

 ans = function();

and not

Code:

function(ans);

. Does that make things clear?

>Do I just call the funtion like this function() or will have to to write ans in the front like this funtion(ans) so it know I want the value in "ans".

after the function call "ans" already has a value. so if you want to use "ans", just use the variable itself. no need for another function(). i believe someone already said this earlier but "ans" (the way you declared it) is only usable in the main().

thanks for the reply

I think I don't know how to put the question . Ok here one more time lol. If I want to call the function() anywhere in other funtion called calculate() what will I write in calculate function, so I can get the value from function().

sorry for making thing complicated.

You mean to pass the value returned by the function() to a new function called calculate()?
Something like this, maybe?

Code:

#include <stdio.h>

//declare functions
int function(void);
int calculate (int a);

int main ()
{
   int abs = function();
   int res = calculate(abs);//takes as parameter the value of function()
   
   printf ("%d", res);
   getchar();   
   return 0;
}

//define functions
int function()
{
   int a;
   a = 1+3;//your example
   return a;
}   

int calculate (int a)
{
   int c;
   c = a+3;
   return c;
}

I think you should take a look here: functions

yes that what I meat , lol finally thanks