Exercise 1

1. Write a Python script to prompt users to enter two values; then perform the basic arithmetical operations of addition, subtraction, multiplication, and division on the values.

# ask 2 input from user
num1 = float(input("Enter first number: "))
num2 = float(input("Enter second number: "))

# perform calculation
print("[add] %.2f + %.2f = %.2f" % (num1, num2, (num1 + num2)))
print("[sub] %.2f - %.2f = %.2f" % (num1, num2, (num1 - num2)))
print("[mul] %.2f * %.2f = %.2f" % (num1, num2, (num1 * num2)))
print("[div] %.2f / %.2f = %.2f" % (num1, num2, (num1 / num2)))

1. Write a Python script to prompt users to enter the lengths of a triangle sides. Then calculate the semi perimeters. Calculate the triangle area and display the result to the user. The area of a triangle is (s(s-a)(s-b)*(s-c))-1/2.

a = float(input("Enter side a: "))
b = float(input("Enter side b: "))
c = float(input("Enter side c: "))

# calculate perimeters
s = (a + b + c) / 2

# calculate areas
area = (s*(s-a)*(s-b)*(s-c)) ** 0.5

print("Triangle of sides [%.2f, %.2f, %.2f] Perimeter: %.2f and Area: %.2f" % (a, b, c, s, area))

1. Write a Python script to prompt users to enter the first and last values and generate some random values between the two entered values.

import random

first = int(input("Enter first number: "))
second = int(input("Enter second number: "))

print(random.randint(first, second))

1. Write a Python program to prompt users to enter a distance in kilometres; then convert kilometres to miles, where 1 kilometre is equal to 0.62137 miles. Display the result.

distkm = float(input("Enter distance in km: "))
print("%.2f km is %.2f miles" % (distkm, (distkm * 0.62137)))

1. Write a Python program to prompt users to enter a Celsius value; then convert Celsius to Fahrenheit, where T(°F) = T(°C) x 1.8 + 32. Display the result.

tempc = float(input("Enter temperature in Celsius: "))
tempf = (tempc * 1.8) + 32
print("Temperature %.2f C is %.2f F" % (tempc, tempf))

1. Write a program to prompt users to enter their working hours and rate per hour to calculate gross pay. The program should give the employee 1.5 times the hours worked above 30 hours. If Enter Hours is 50 and Enter Rate is 10, then the calculated payment is Pay: 600.0.

whours = int(input("Enter your working hours: "))
rate = float(input("Enter your hourly rate: "))
totalsalary = 0.0

if whours <= 30 :
    totalsalary = whours * rate
else :
    totalsalary = (30 * rate) + ((whours - 30) * (10 * 1.5))

print("Total working hours: %d with rate: %.2f per hour. Total salary: %.2f" % (whours, rate, totalsalary))

1. Write a program to prompt users to enter a value; then check whether the entered value is positive or negative value and display a proper message.

number = int(input("Enter a number: "))

if number > 0 :
    print("You have entered %d, a positive number" % number)
elif number < 0 :
    print("You have entered %d, a negative number" % number)
else :
    print("You have entered %d" % number)

1. Write a program to prompt users to enter a value; then check whether the entered value is odd or even and display a proper message.

number = int(input("Enter a number: "))

if number % 2 == 0 :
    print("You have entered %d, an even number" % number)
else :
    print("You have entered %d, an odd number" % number)

1. Write a program to prompt users to enter an age; then check whether each person is a child, a teenager, an adult, or a senior. Display a proper message.

age = int(input("Enter age: "))

if age > 0 and age < 13 :
    print("You are %d years old, a child" % age)
elif age >= 13 and age <= 17 :
    print("You are %d years old, a teenager" % age)
elif age >= 18 and age <= 59 :
    print("You are %d years old, an adult" % age)
elif age > 59 :
    print("You are %d years old, a senior" % age)
else :
    print("You have entered %d an invalid age" % age)

1. Write a program to prompt users to enter a car’s speed; then calculate fines according to the following categories and display a proper message.

speed = float(input("Enter car speed: "))

if speed > 0 and speed <= 80 :
    print("Total fine: 0")
elif speed >= 81 and speed <= 99 :
    print("Total fine: 200")
elif speed >= 100 and speed <= 109 :
    print("Total fine: 350")
elif speed > 109 :
    print("Total fine: 500")
else :
    print("Invalid car speed")

1. Write a program to prompt users to enter a year; then find whether it is a leap year. A year is considered a leap year if it is divisible by 4 and 100 and 400. If it is divisible by 4 and 100 but not by 400, it is not a leap year. Display a proper message.

year = int(input("Enter a year: "))

if year % 4 == 0 and year % 100 == 0 and year % 400 == 0 :
    print("%d is a leap year" % year)
else :
    print("%d is not a leap year" % year)

1. Write a program to prompt users to enter a Fibonacci sequence. The Fibonacci sequence is the series of numbers 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, .... The next number is found by adding the two numbers before it. For example, the 2 is found by adding the two numbers before it (1+1). Display a proper message.

number = int(input("Enter a number: "))

first = 0
second = 1
next = first + second
print(first)
print(second)
print(next)

i = 0
while i <= (number - 3) :
    first = second
    second = next
    next = first + second
    print(next)
    i += 1