#
# file: four_numbers.py
#
# The program takes three values from the user (decimal values) and
# returns their product, their sum, their absolute values, and their average.
# Uses functions.
#

# prints the introduction message
def hello():
    print("This program asks for three decimal numbers, and then finds:")
    print(" their product,\n their sum,\n their absolute values,\n and their average")

def main():

    hello()
    
    try:
        a = float(input("Please input a decimal number:"))
        b = float(input("Please input another decimal number:"))
        c = float(input("Please input the last decimal number:"))
        
        product(a,b,c)

        sum_(a,b,c)

        absolute_v(a,b,c)

        average(a,b,c)

    except:
        print("Incorrect input.")


# finds the product of three values
def product(x1,x2,x3):
    print("\nThe product of three numbers {0} x {1} x {2} = {3}".format(x1,x2,x3,x1*x2*x3))

# finds the sum of three values
def sum_(s1,s2,s3):
    print("The sum of three numbers {0} + {1} + {2} = {3}".format(s1,s2,s3,s1+s2+s3))

def absolute_v(a,b,c):
    print("|{0:f}| = {1:f}".format(a,abs(a)))
    print("|{0:f}| = {1:f}".format(b,abs(b)))
    print("|{0:f}| = {1:f}".format(c,abs(c)))

def average(a,b,c):
    print("({0} + {1} + {2})/3={3}".format(a,b,c,(a+b+c)/3.0))

main()