Question 1

Problem 1

if-elif-else Statement: Write a Python program that prompts the user for an integer and then prints whether that number is positive, negative, or zero.

Please enter an integer: -5
Your integer is negative.

Answer

Python Code

int_type = ""
user_int = int(input("Please enter an integer: "))
if user_int < 0:
    int_type = "negative"
elif user_int == 0:
    int_type = "zero"
else:
    int_type = "positive"
print("Your integer is " + int_type + ".")

Output

Please enter an integer: 55
Your integer is positive.

Solution Notes:

First, notice that I use the int() function to convert the user-supplied age to an integer since anything entered at an input prompt is read as a string.
Second, the if condition uses the less than operator to determine whether the user's integer is less than zero.
If the integer is not less than zero, execution passes to the elif, which tests if the integer is zero with the == comparison operator.
If the integer is not less than zero and not zero, then the else is executed since the only other possibility is that the integer is positive.

Question 2

Problem 2

if-elif-else Statement: Write a Python program that prompts the user for two integers and then prints their relationship, that is, is the first number larger than the second, equal to the second, or smaller than the second?

--------------------------------------------------
This program will prompt you for two integers,
then it will tell you their relationship:
--------------------------------------------------
Please enter your first integer: 10
Please enter your second integer: 20
Your first integer is smaller than your second integer.

Answer

Python Code

response = ""
print("-" * 50)
print("This program will prompt you for two integers,")
print("then it will tell you about their relationship:")
print("-" * 50)
user_int_1 = int(input("Please enter your first integer: "))
user_int_2 = int(input("Please enter your second integer: "))
if user_int_1 < user_int_2:
    response = "smaller than"
elif user_int_2 == user_int_2:
    response = "equal to"
else:
    response = "larger than"
print("Your first integer is " + response + " your second integer.")

Output

--------------------------------------------------
This program will prompt you for two integers,
then it will tell you their relationship:
--------------------------------------------------
Please enter your first integer: 10
Please enter your second integer: 20
Your first integer is smaller than your second integer.

Solution Notes:

First I initialize a variable that will hold a portion of a string for output. In Python, this is not a requirement, that is to initialize a variable, but it is often viewed as a good programming practice.
This program example demonstrates a common practice of providing instructions to the user. First, the print("-" * 50) prints a line of 50 dashes, which is intended to create a header in the output on lines 1 and 4.
Some instructions are also provided to the user, between the two dashed lines.
The two user prompts collect two integers.
Then the if statement first tests if the first integer has a smaller value than the second by using the less than operator. If so, the response variable is set.
.If the first integer is not smaller than the second, the elif is executed next which compares the two integers to see if they are equal.
If the first integer is not smaller than the second and they are not equal, the only other possibility is that the first is larger than the second which is handled by the else portion of the decision structure.
Lastly the final print statement concatenates an output sentence with the response variable set above.

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Problem 1

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Problem 2

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