7 Problems on Operators and Variables

Python is flexible about variable declaration. You do not need to give data type of a variable at the time of it’s declaration.
a=5 (We can say here that “a” stores the integer 5.)
Valid:defined a variable ‘a’ and passed a value of 5 to it.
This statement has three parts:

1. Variable name
2. Assignment operator
3. Variable value

A program is essentially a manipulation of data.
The logic is what you code.
The variables hold the data.
Operators act on variables.

Perimeter of a circle
Input: Radius (int or float)
Logic: 2 * Pi * Radius
Output: float

Lessons:
1. How to declare a variable?
2. How to use operators on it?

In Code

# Variable declaration. r is holding the radius.
r = input("Enter the radius: ") # input() gives you a string
r = float(r) # Type casting builtin for getting the float value of r
perimeter = 2 * 3.14 * r # Computation
print(perimeter)

Problems
# 1

Declare two integer variables.
And perform arithematic operations on them.

# 2 

Take two user inputs: dividend and divisor.
Now perform division on them.

#3

Take input.
Name: Radius

Calculate: 
Perimeter of the circle.
Area of the circle.


HINT:
Step 1: declare a variable to take user input
Step 2: declare a second variable Pi.
Step 3: use the above two variables in formula to find the perimeter. 

#4

1. Take two integers as input.
2. Show if they are equal or unequal.

#5

1. Take three inputs. Name them length, width and height
2. Find the volume of the cuboid.

3. Find the area of this cuboid.
= 2*l*w + 2*w*h + 2*l*h

#6

1. Take an integer as input. Name it 'side'.
2. Print the volume of the cube.
3. Print the surface area of the cube.

#7

Find the area of the equilateral triangle.

Solutions

x = 4
y = 9

x + y

x - y

dividend = 8

divisor = 2

dividend / divisor

import math

radius = 5

perimeter = 2 * math.pi * radius

area = math.pi * radius * radius

a = 7
b = 8
print(a == 8)

l = 5
w = 7
h = 9
v = l * w * h
print(v)
315

2*l*w + 2*w*h + 2*l*h

286

side = 5
area = math.sqrt(3) * pow(side, 2) / 4
print(area)

10.825317547305483

Tags: Python,Technology,