10 While Loop Programs in Python for beginners

While loop is a versatile loop in Python used for repeated execution of a block of statements. The number of times this set of statements is executed depends on the condition expression of While Loop. The block of statements of the while loop are executed for the duration the condition is TRUE. As soon as the condition expression evaluates to FALSE, loop terminates. Here are 10 basic While Loop Programs in Python for absolute beginners.

1. Print prime numbers between 1 and 100

This program prints all the prime numbers between 1 and 100. Nested while loops are used in this program.

#initialize variables for loop
i=1
p=0
while i<=100:
    k=2
    while k<i:
        if (i%k==0):
            p=1
            break
        k=k+1
        if (p==0):
        print(i)
    p=0
    i=i+1

2. Print Factorial of a number entered by user.

In the list of While Loop Programs in Python, this program asks user for a number and prints its factorial.

value=int(input("Enter a number"))
fact=1
i=1
while value>=1:
    fact=fact*value
    value=value-1
print(fact)

3. Write a While Loop program in Python to print table of multiples of a given number

This program asks user to enter a number and prints its table of first 10 multiples

value=int(input("Enter a number"))
i=1
while i<=10:
    print(str(value)+"X"+str(i)+"="+str(value*i))
    i=i+1

4. Print Even Numbers using While Loop in Python

This program accepts a number from user and prints all even numbers in the range of 1 and the user given number

value=int(input("Enter a number"))
i=1
while i<=value:
    if (i%2==0):
        print(i)
    i=i+1

5. Numbers divisible by 5 in a given range from 1

This program accepts a number from user and prints all the numbers divisible by 5 starting from 1.

value=int(input("Enter a number"))
i=1
while i<=value:
    if (i%5==0):
        print(i)
    i=i+1

6. Count Vowels in a given string using While Loop.

This program counts vowels in a string entered by a user and displays its count.

value=input("Enter a sring")
i=0
count=0
while i<len(value):
    if value[i] in("a","e","i","o","u"):
        count=count+1
    i=i+1
print(count)    

7. Check if a string is Palindrome

This program accepts a string and checks if it is a palindrome.

value=input("Enter a sring")
i=len(value)-1
j=0
# initalise two strings
rev=""
act=""
#initialise end index of second half
end=0
if len(value)%2==0:
    end=len(value)/2
else:
    end=len(value)/2-1
    
#extract first half
while j<len(value)/2:
    act=act+value[j]
    j=j+1
    
#extract second half
while i>=end:
    rev=rev+value[i]
    i=i-1
#compare two halves

if act==rev:
    print(value +" is a palindrome")
else:
    print(value +" is not a palindrome")

8. Print Fibonacci series for a number

This program accepts a number and prints its Fibonacci series

#Read the value
value=int(input("How many Fibonacci numbers to print"))
# initialize variables
anc=0
par=1
i=0
#print
print(anc)
print(par)
cur=par
print(cur)
#repeat loop to generate next fibonacci number
while i<=value:
    anc=par
    par=cur
    cur=anc+par
    print(cur)
    i=i+1

9. Print Sum of Squares

This program reads a number and prints the sum of squares using While Loop in Python

#enter a number 
value=int(input("Enter a number"))
# initialize variables
i=0
total=0
#repeat loop to print squares of numbers
while i<=value:
    total=total+i*i
    i=i+1

print(total)  

10. Print Reverse of a string

This program accepts a string from user and prints its reverse.

#Read the string
value=input("Enter a string")
# initialize variables
rev=""
i=len(value)-1
#repeat loop to print last to first character
while i>=0:
    rev=rev+value[i]
    i=i-1
print(rev)    

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