void function issue

[Manuel Di Criscito]

I have an issue while assigning values in a void function..
Outputs = 0, 0;

void AssignValue( sdl_rect rect, int xx, int yy)
{
  Rect.x = xx;
  Rect.y = yy;

}

And

...
AssignValue(dstrect, 50, 100);
cout << dstrect.x << endl;
cout << dstrect.y << endl;
...

Output = 0..
Can you help me? I need it.. thanks!

[SamuelAdams]

I'm not sure this is what you want but shows an example how to get it to print.

void AssignValue( int xx, int yy)
{
  cout << xx;
  cout << ",";
  cout << yy;
}

int main()
{
AssignValue(50, 100);
return 0;
}

[Manuel Di Criscito]

No.. i don't want to print anything..
I wrote "cout" only for testing the results..
I'll explain:
There's a void function.. than function assign value to a Rect of type Sdl_rect ( i am using SDL2 now )..
If i assign value to the rect by "AssignValue(dstrect, 50, 100), dstrect doesn't change value like i want.. members of this are x,y,w,h.. they keep 0.
The void function is above.. please i need help.. i always did the same with free free pascal and it always worked for me.. please

[norwahidasham]

void function does not return values

[1vRz3TCk]

Manuel Di Criscito, read up on passing by reference.

[lastchance]

Yes, please note CodeMonkey's post. It WILL change values if you make the parameter a reference, using &.

Thus:
void AssignValue( sdl_rect &Rect, int xx, int yy)

(Note that I have added & ... but I have also changed your original rect (lower case r) to Rect (upper case R) - I'm surprised that your code as written actually compiled.)

You may want to read up on 'constructors' too, as this seems to be what AssignValue is actually doing and it would be quite natural here. Also, make sure that members x and y of your class or structure sdl_rect are public and not private.

[Manuel Di Criscito]

Oh thanks, i'll try.
I was writing this topic on the phone.. too possible for presence of errors but syntax is correct i think..
What happens adding &??
I am still learning c++ and coming out from object-pascal programming ( always with SDL2 lib).
I downloaded an app "Learn C++" by SoloLearn .
I am italian but i still learn c++ from that app!
So.. what happens adding & ? I should see