import math
g = 9.81
pi = math.pi
def get_distance(velocity:float, angle:float)-> float:
"""
Calculates the distance a projectile travels on a flat surface
given its intial velocity, as well as the angle of fire relative
to the x-axis. The angle is given in radian. This function assumes
perfect physics, i.e., constant gravity, no air resistance, etc.
>>> get_distance(0, 1)
0.0
>>> get_distance(1, 0)
0.0
>>> get_distance(10, 0.25*pi)
10.19367991845056
"""
#Your code goes here
return velocity**2 * math.sin(2*angle) / g
def degrees_to_radians(d:float)-> float:
"""
Takes in an angle in degrees, d, and returns an equivalent
angle in radians
>>> degrees_to_radians(0)
0.0
>>> degrees_to_radians(180)
3.141592653589793
"""
#Your code goes here
return d/180*pi
def get_radian_of(angle_string: str)-> float:
"""
Takes in a valid input angle_str and returns the numerical value of the
angle in radians.
Examples:
>>> get_radian_of("1.2r")
1.2
>>> get_radian_of("45d")
0.7853981633974483
"""
#Your code goes here
if angle_string[-1] in ['r','R']:
return angle_string[:-1]
else:
a = float(angle_string[:-1])
return degrees_to_radians(a)
def is_a_number(s:str)-> bool:
"""
Returns True if and only if s is a string representing a positive number.
Examples:
>>> is_a_number("1")
True
>>> is_a_number("One")
False
>>> is_a_number("-3")
False
>>> is_a_number("3.")
True
>>> is_a_number("3.1.2")
False
"""
#Your code goes here
if s.isnumeric():
if float(s) >= 0:
return True
else:
return False
else:
return False
def is_valid_angle(s:str)-> bool:
"""
Returns True if and only if s is a valid angle. See the assignment
description and examples for more information regarding what's valid
Examples:
>>> is_valid_angle("85.3d")
True
>>> is_valid_angle("85.3.7D")
False
>>> is_valid_angle("90d")
False
>>> is_valid_angle("0.001r")
True
>>> is_valid_angle("1.5R")
True
"""
#Your code goes here
if s[-1] not in ['d','D','r','R']:
return False
if s[-1] in ['d','D']:
try:
if float(s[:-1]) >= 0 and float(s[:-1]) <= 90:
return True
else:
return False
except:
return False
else:
try:
if float(s[:-1]) >= 0 and float(s[:-1]) <= pi/2:
return True
else:
return False
except:
return False
def approx_equal(x, y, tol):
"""
Returns True if and only if x and y are with tol of each other.
Examples:
>>> approx_equal(1,2,1)
True
>>> approx_equal(4,3,1)
True
>>> approx_equal(4,3,0.99)
False
>>> approx_equal(-1.5,1.5,3)
True
"""
#Your code goes here
if math.fabs(x-y) < tol:
return True
else:
return False
"""
DO NOT MODIFY THE CODE BELOW.
You are not required/expected to understand the following code.
If you're interested though, take a look.
"""
if __name__ == "__main__":
while True:
target = float(input("Enter a target distance: "))
tol = float(input("Enter how close you need to be to your target: "))
target_hit = False
while not target_hit:
valid_velocity = False
while not valid_velocity:
v = input("Enter a valid velocity: ")
valid_velocity = is_a_number(v)
valid_angle = False
v = float(v)
while not valid_angle:
theta = input("Enter a valid angle: ")
valid_angle = is_valid_angle(theta)
theta = get_radian_of(theta)
d = get_distance(float(v), theta)
target_hit = approx_equal(target, d, tol)
if target_hit:
print("Congratulations! You hit the target.")
elif target > d:
print("The shot hit short of the target, try again.")
else:
print("The shot hit past the target, try again.")
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狗仔卡
发表于 2018-10-3 00:30:17
置顶卡
千斤顶
显身卡
发表于 2018-10-3 20:44:49
还写不出我要的东西
然而写的很蠢
200大元，被强悍的恐怖份子扫了
UT警告(手动滑稽)