Ten pigs were all in a pen, enjoying their morning slop when a bird flew down from a nearby tree and began picking all the best bits out from the trough. This greatly perturbed the pigs and so the pig brothers and pig sisters went to the back of their sty and rolled out their hog-howitzer, determined to knock the smug look off the bird's face (and in fact, knock the entire bird out of the tree!)

Mechanics:

The game generates a random number from 0 to 173.  This represents the height of the bird, which rests at the top of the tree. The player then has 10 shots to knock the bird out of the tree by firing pigs at it. The player fires the pigs with the hog-howitzer, which can be angled from zero to 60 degrees.  The angle can be changed either allowing the player to type in a number, or using the up and down barrel buttons which will raise or lower the angle of the howitzer by half a degree with each click.  The game should not allow the angles to be raised above 60 or below 0, appropriate warnings should be given.  The game should also error check for junk data in the text box, with an appropriate error. 
 
To see if the player hits the target, first convert the degrees from the text box to radians (by multiplying it by Π/180) .  The gun and the tree are 100 feet apart, so using high school trigonometry the player's shot is calculated as tan(n)*100, where n is the degrees after being converted to radians.  If the value computed from the user's input is within plus or minus 2 of the random number, the player has knocked the bird from the tree and wins.  Otherwise, the user is told that their shot is too high or too low. If the bird remains in the trees after all 10 shots, the player loses.  Note, the game should show the player their number of remaining shots.

The game should also have a menu bar with an option to quit, or reset.  Reset returns all values to origin and generates a new random height for the bird.