Question

In Python

Exercise – For & While Loops

Create a new file called loops.py and use it for all parts of this exercise. Remember the difference between input and raw input?

Be sure to test your code for each part before moving on to the next part.

1. Write a program using a for loop that calculates exponentials. Your program should ask the user for a base base and an exponent exp, and calculate base^exp.
2. Write a program using a while loop that asks the user to enter a number that is divisible by 2. Give the user a witty message if they enter something that is not divisible by 2-and make them enter a new number. Don’t let them stop until they enter an even number! Print a congratulatory message when they *finally* get it right.

Answer 1

SOURCE CODE:

f=open("loops.py","a+") #open file in the append mode with loops.py as filename
print("Enter the base value:")
base=input()
print("Enter the Exponent value:")
exp=int(input())
f.write("base value is:"+str(base)+" and Exponent is:"+str(exp)+"\n") #writes the values of base and exponent into the file ,we cant concat int(base and exp) directly to string so we need to change by using str().
baseexp=1
for i in range(0,exp):
baseexp=baseexp*int(base) #multiplies the baseexp exp times as loop repeats exp times
f.write("The baseexp is:"+str(baseexp)+"\n") #writes result to the file
while 1: #util we break the loop it will repeats
print("Enter number divisible by 2")
num=int(input())
f.write("You Entered value is:"+str(num)+"\n") #writs to file
if num%2==0: #condition to check that the number is divisible by 2 or not
f.write("Congratulations you *finally* get it right"+"\n")
break;#if user enters the correct number the loop will break and program terminates
else:
f.write("Enter the number that should be divisible by 2"+"\n") #error message

#All the operations we performed are listed in the file

OUTPUT FILE:

main.py loops.py

base value is:2 and Exponent is:3

The baseexp is: 8

You Entered value is:

9

Enter the number that should be divisible by 2,

You Entered value is:7

Enter the number that should be divisible by 2

You Entered value is:

2

Congratulations you *finally* get it right 10