Functions - Upset Fowls

In this assignment, youll make a knockoff version of the Angry Birds game. The starter program is a working first draft of the game.

1. Correct the first FIXME by moving the intro text to a function named PrintIntro. Development suggestion: Verify the program has the same behavior before continuing.

2. Correct the second FIXME. Notice that the function GetUsrInpt will need to return two values: fowlAngle and fowlVel.

3. Correct the third FIXME. Notice that the function LaunchFowl only needs to return the value fowlLandingX, but needs the parameters fowlAngle and fowlVel.

4. Correct the fourth FIXME. Notice that the function DtrmnIfHit only needs to return the value didHitSwine, but needs the parameters fowlLandingX and swineX.

The main should now look like the following code and the program should behave the same as the first draft:

intmain(){

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 fowl LandingX=0.0;//fowls horiz.dist.from start(m)

boo ldid Hit Swine=false;//did hit the swine?

srand(time(0));

swineX=(rand()%201)+50;

PrintIntro();

GetUsrInpt(swineX,fowlAngle,fowlVel);

fowlLandingX=LaunchFowl(fowlAngle,fowlVel);

didHitSwine=DtrmnIfHit(fowlLandingX,swineX);

return0;

}

5. Modify the program to continue playing the game until the swine is hit. Add a loop in main that contains the functions GetUsrInpt, LaunchFowl, and DtrmnIfHit.

6. Modify the program to give the user at most 4 tries to hit the swine. If the swine is hit, then stop the loop

Here is an example program execution (user input is highlighted here for clarity):

WelcometoUpsetFowl!

The objective is to hit the Mean Swine.

The Mean Swine is 84 meters away.

Enter launch angle(deg):45

Enter launch velocity(m/s):30

Time 1 x= 0 y= 0

Time 2 x= 21 y= 16

Time 3 x= 42 y= 23

Time 4 x= 64 y= 20

Time 5 x= 85 y= 6

Time 6 x=106 y=-16

The Mean Swine is 84 meters away.

Enter launch angle(deg):45

Enter launch velocity (m/s):25

Time 1 x= 0 y= 0

Time 2 x= 18 y= 13

Time 3 x= 35 y= 16

Time 4 x= 53 y= 9

Time 5 x= 71 y= -8

Hit'em!!!

Starter code:

#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; }

int main() { double t = 1.0; // time (s) double fowlY = 0.0; // object's height above ground (m) double fowlAngle = 0.0; // angle of launch of fowl (rad) double fowlVel = 0.0; // velocity of fowl (m/s) double fowlX = 0.0; // object's horiz. dist. from start (m) double fowlLandingX = 0.0; // fowls horiz. dist. from start (m) double swineX = 0.0; // distance to swine (m) double beforeSwineX = 0.0; // distance before swine that is acceptable as a hit (m) bool didHitSwine = false; // did hit the swine? srand(time(0)); swineX = (rand() % 201) + 50; // FIXME Make into a function called PrintIntro cout << "Welcome to Upset Fowl! "; cout << "The objective is to hit the Mean Swine by launching an Upset Fowl. ";

// FIXME Make into a function called GetUsrInpt cout << " The Mean Swine is " << swineX << " meters away. "; cout << "Enter fowl launch angle (deg): "; cin >> fowlAngle; fowlAngle = DegToRad(fowlAngle); // convert to radians cout << "Enter fowl launch velocity (m/s): "; cin >> fowlVel; // FIXME Make into a function called LaunchFowl 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;

// FIXME Make into a function called DtrmnIfHit beforeSwineX = swineX - 30; if ((fowlLandingX <= swineX) && (fowlLandingX >= beforeSwineX)) { cout << "Hit'em!!!" << endl; didHitSwine = true; } else { cout << "Missed'em..." << endl; didHitSwine = false; }

return 0; }

Missed'em...

Please cross check the code when done. Thank you