# Cone Volume and Surface Area Calculator #
import math
punctuation ='.'
def is_nneg_float(s):
    i=s.find('.')
    if i==-1 and s.isdigit():
        return True
    else:
        if s[0:i].isdigit() and s[i+1].isdigit():
            return True
        else:
            return False

def get_nneg_float(p):
    while True:
        s=input(p)
        if is_nneg_float(s)==True:
            break
        else:
            print("invalid input")
            continue
    return float(s)

print("This program finds the cone surface area and the cone")
print("volume when given the radius and height of the cone.")
print("="*50)

def cone_surface_area(r_float,h_float):
    return((math.pi)*(r_float**2) + (math.pi)*(r_float)*(math.sqrt((r_float**2)+(h_float**2))))
def cone_volume(r_float,h_float):
    return(((math.pi)*(r_float**2)*h_float)/3)

r_float = get_nneg_float(("Please input an integer for the radius "))
print("="*50)
h_float = get_nneg_float(("Please input an integer for the height "))
print("="*50)

c_s_a = round(cone_surface_area(r_float,h_float),2)
c_v = round(cone_volume(r_float,h_float),2)


print("Cone radius is :", r_float,"ft")
print("Cone height is :", h_float,"ft")
print("Cone Suface Area is equal to:",c_s_a,"ft^2")
print("Cone Volume is equal to:",c_v,"ft^3")