include

include

include

include

include

using namespace std;

const double pi = 3.14159265;
const double grav = 9.8; // Earth gravity (m/s^2)

// Given time, angle, velocity, and gravity
// Update x and y values
void Trajectory(double t, double a, double v,
double& x, double& y) {
x = v * t * cos(a);
y = v * t * sin(a) – 0.5 * grav * t * t;
return;
}

// convert degree value to radians
double DegToRad(double deg) {
return ((deg * pi) / 180.0);
}

// print time, x, and y values
void PrintUpdate(double t, double x, double y) {
cout << “Time ” << fixed << setprecision(0)
<< setw(3) << t << ” x = ” << setw(3)
<< x << ” y = ” << setw(3) << y << endl;
return;
}

// print intro message
void PrintIntro() {
cout << “Welcome to Upset Fowl!\n”;
cout << “The objective is to hit the Mean Swine by launching an Upset Fowl.\n”;
}

// get user input for fowlVel and fowlAngle
void GetUsrInpt(double swineX, double& fowlAngle, double& fowlVel) {
cout << “\nThe Mean Swine is ” << swineX << ” meters away.\n”; cout << “Enter fowl launch angle (deg): “; cin >> fowlAngle;
fowlAngle = DegToRad(fowlAngle); // convert to radians
cout << “Enter fowl launch velocity (m/s): “; cin >> fowlVel;
return;
}

// caculate where the fowl will land
double LaunchFowl(double fowlAngle, double fowlVel) {
double t = 1.0; // time (s)
double fowlY = 0.0; // object’s height above ground (m)
double fowlX = 0.0; // object’s horiz. dist. from start (m)
double fowlLandingX = 0.0; // fowl’s horiz. dist. from start (m)

do {
    PrintUpdate(t, fowlX, fowlY);
    Trajectory(t, fowlAngle, fowlVel, fowlX, fowlY);
    t = t + 1.0;
} while (fowlY > 0.0); // while above ground
PrintUpdate(t, fowlX, fowlY);
fowlLandingX = fowlX;
return fowlLandingX;

}

// determine if the swine is hit
double DtrmnIfHit(double swineX, double fowlLandingX) {
double beforeSwineX = 0.0; // distance before swine that is acceptable as a hit (m)
bool didHitSwine = false; // did hit the swine?

beforeSwineX = swineX - 30;
if ((fowlLandingX <= swineX) && (fowlLandingX >= beforeSwineX)) {
    cout << "Hit'em!!!" << endl;
    didHitSwine = true;
}
else {
    cout << "Missed'em..." << endl;
    didHitSwine = false;
}
return didHitSwine;

}

int main() {
double fowlAngle = 0.0; // angle of launch of fowl (rad)
double fowlVel = 0.0; // velocity of fowl (m/s)
double swineX = 0.0; // distance to swine (m)
double fowlLandingX = 0.0; // fowl’s horiz. dist. from start (m)
bool didHitSwine = false; // did hit the swine?
int numtry = 1; // number of tries user getts before ending game

srand(time(0));
swineX = (rand() % 201) + 50;

PrintIntro();

do {
    GetUsrInpt(swineX, fowlAngle, fowlVel);
    fowlLandingX = LaunchFowl(fowlAngle, fowlVel);
    didHitSwine = DtrmnIfHit(swineX, fowlLandingX);
    numtry = numtry + 1;
} while ((didHitSwine != 1) && (numtry <= 4)); // while swine is not hit or 4 tries

return 0;

}

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