conflicting types for...

**dudinka** · 05-14-2005

hi !
(thanx for the hlp the previous time)

I'm trying to call a function from another function:

Code:

void movement(int num_discs) {
     double i=basic_data[0];
     int j,k;
     .......
     .......
     wall_collision(num_discs);
     .....
}

void wall_collision(int num_discs) {
     double smallx,smally,bigx,bigy;
     int k;
     if(.........
}

main() {
       int num_discs /* it is pre-defind */;
       movement(num_discs);
}

the error I get:
"conflicting types for 'wall_collision' "
and:
"previous implicit declaration of 'wall_collision' was here "
(points to this line:

Code:

wall_collision(num_discs);

)

what could it be ?
can't I declare double/int... variables inside a function that gets an int value for example ?

-------------------------------------------

and... - what could the problem be:

Code:

if(disc[k].r=fabs(disc[k].x-basic_data[6]) || disc[k].r=fabs(disc[k].x-basic_data[7])) {............

I get: "invalid lvalue in assignment".

thanks a lot !

**learninC** · 05-14-2005

To eliminate the problem, either u use function prototypes declaration, or you arrange your function wall_collision before the function movement, as function should be declared before they are used.

Code:

void wall_collision(int num_discs) {
     double smallx,smally,bigx,bigy;
     int k;
     if(.........
}

void movement(int num_discs) {
     double i=basic_data[0];
     int j,k;
     .......
     .......
     wall_collision(num_discs);
     .....
}
int main(void) {
     int num_discs /* it is pre-defind */;
     movement(num_discs);
     return 0;
}

To use function prototypes, do as follows:

Code:

void movement(int); 
void wall_collision(int );

int main(void) {
     int num_discs /* it is pre-defind */;
     movement(num_discs);
     return 0;
}

void movement(int num_discs) {
     double i=basic_data[0];
     int j,k;
     .......
     .......
     wall_collision(num_discs);
     .....
}

void wall_collision(int num_discs) {
     double smallx,smally,bigx,bigy;
     int k;
     if(.........
}

Hope it helps.

**dudinka** · 05-14-2005

it fixed it, thank u !

---> any idea about the second problem ?

the structure: "disc" is defined outside the functions and so is the array "basic_data".

??

**dudinka** · 05-14-2005

thanx anyway, guess I'm still an idiot in C...

"=" instead of "==" in IF statement........

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