Evel Kneievel

[Mattrat]

I need help quickly starting this function. I'm on limited time so if anyone can help me quickly that would be Great!



https://mail.google.com/mail/u/1/?ui=2&ik=bf2b82cafb&view=att&th=163225431ee5cd1f&attid=0.1&disp=safe&realattid=1632253b85af6830dd51&zw

[Handy Andy]

Hello Mattrat,

I tried your link, but it does not work for me.

Andy

[Mattrat]

Maybe try it again. It worked fine for me.

This is what I have so far, for this program.

//Matthew Final Program
#include <iostream>
#include <iomanip>
#include <cmath>
using namespace std;
const double g=32.2;//acceleration due to gravity
const double k=0.158;//air drag constan
void inputValues(double& v, double& A);
double xcalc(double v, double A);
double ycalc(double v, double A);
double tcalc(double v, double A);

int main(){

cout<<"Take off angle:"
cout<<"Take off speed:"
cout<<"\n";
cout<<"time(s)"<<"x-distance(ft)"<<"y-distance(ft)"<<endl;
cout<<tcalc(v,A)<<" "<<xcalc(v,A)<<" "<<ycalc;
return 0;




}

void inputValues(double& v, double& A){
cout<<"Matthew Cibulka\n";
cout<<"Please enter the take off speed in mph:\n";
cin>>v;
cout<<"Please enter the take off angle in degrees:\n";
cin>>A;
return;
}

double xcalc(double v, double A){
double x=0;
double t=0;
while(
x=((v*cos(A)/(k))*(1-exp(-k*t)));
return x;
}

double ycalc(double v, double A){
double y=0;

double t=0;

y=((-g*t)/(k)+(1/k)*(v*sin(A)+(g/k))*(1-exp(-k*t)));
return y;
}

double tcalc(double v, double A){
double t=0;

t=t+0.5;
return t;
}

[lastchance]

You don't know the difference between degrees and radians. cos() and sin() require the angle in radians, but your input is asking for one in degrees.

t (time) is an independent variable, not a function of v and A. At a rough guess you would be outputting a table of values at equal increments in time.

Your formulae for x and y appear to be correct for a linear drag force, but they are heavily overbracketed and difficult to read. x should obviously NOT be set within a while loop. It's just evaluated once at that particular value of t.

You will need to pass time t as argument to both xcalc and ycalc.

You have plenty of prompts, but no input statements in main. You need to actually call inputValues() there. After that, I expect that you will need a loop over times, but I don't know what your assignment asks.

I have no intention of looking at the external mail link you provide and I suspect most other forum users would think twice, given the URL.

Please PUT YOUR CODE IN CODE TAGS.

[Mattrat]

I have already submitted it so what grade do you believe I will get?

[E0p9LyTq]

Maybe try it again. It worked fine for me.

That is your personal GMail account you are linking to. Of course it works for you and no one else.

[dhayden]

When I try to compile your code I get four compilation errors. I've been out of school for a long time but when I was there, several profs would give zero points for a program that didn't compile :(.