You are using a version without Ads of this website. Please, consider donating:

### (simple) motion of a projectile

Hello guys,
I have been staring at this piece of code (the complete program) trying to figure out why it's not working!
It gives a (very) funny output. why?? it's so simple. It should work (even if my PI approximation is crap)

Edit: forgot to say, the program simply outputs in 4 columns X,Y and T at 200 points from 0 degrees to 90 degrees.

 ```double get_X(int in_vel, double angle) //horizontal range { double X=0; const double g=9.801; X=(in_vel)*(in_vel)*(sin(2*angle))/g; return X; } double get_Y(int in_vel, double angle) //maximum height reached { double Y=0; const double g=9.801; Y=(in_vel)*(in_vel)*((sin(angle))*(sin(angle)))/2*g; return Y; } double get_T(int in_vel, double angle) //time to reach that height { double T=0; const double g=9.801; T=(in_vel)*(sin(angle))/g; return T; } int main() { double angle=0; double in_vel=10; for (int i=0;i<200;i++) { cout<
Last edited on
I kind of solved it.
Now it works fine and the outputs are all different.
Still, the values are too small. There is something that still needs to be fixed.

 ```double get_X(double in_vel, double angle) { double X=0; const double g=9.801; X=(((in_vel)*(in_vel))*sin(2*angle))/g; return X; } double get_Y(double in_vel, double angle) { double Y=0; const double g=9.801; Y=(in_vel)*(in_vel)*((sin(angle))*(sin(angle)))/2*g; return Y; } double get_T(double in_vel, double angle) { double T=0; const double g=9.801; T=(in_vel)*(sin(angle))/g; return T; } int main() { double angle=0; double in_vel=10; for (int i=0;i<200;i++) { cout<
The issue is in here, I think:

 ```double get_X(double in_vel, double angle) { double X=0; const double g=9.801; X=(in_vel*in_vel)*sin(2*angle)/g; return X; }```

Can anybody spot any mistake?
When you call those functions, you seem to be supplying the arguments in the wrong order.
OMG, I love you.

Yes you are perfectly right. And now everything works perfectly.
Thank you so much.
Topic archived. No new replies allowed.