Examples of While loop

This blog contain 10 examples of while loop

Example 1 : Printing numbers from 1 to 10

num = 1
while num <= 10:
    print(num)
    num+=1

Output

1
2
3
4
5
6
7
8
9
10

Example 2 : Printing even numbers from 1 to 50

num = 1
while num <= 50:
    if num%2 == 0:
        print(num)
    num+=1

Output

2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50

Example 3 : Printing odd numbers from 1 to 50

num = 1
while num <= 50:
    if num%2 != 0:
        print(num)
    num+=1

Output

1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49

Example 4 : Printing table of 2

num = 1
table2 = 2
while num <= 10:
    res = table2 * num
    print('%d * %d = %d'%(table2,num,res))
    num+=1

Output

2 * 1 = 2
2 * 2 = 4
2 * 3 = 6
2 * 4 = 8
2 * 5 = 10
2 * 6 = 12
2 * 7 = 14
2 * 8 = 16
2 * 9 = 18
2 * 10 = 20

Example 5 : Printing square of number from 1 to 10

num = 1
while num <= 10:
    res = num*num
    print('Square of %d : %d'%(num,res))
    num+=1

Output

Square of 1 : 1
Square of 2 : 4
Square of 3 : 9
Square of 4 : 16
Square of 5 : 25
Square of 6 : 36
Square of 7 : 49
Square of 8 : 64
Square of 9 : 81
Square of 10 : 100

Example 6 : Finding area of a circle for radius 1 to 10

num = 1
pi = 3.14
while num <= 10:
    radius = num * num
    area_of_circle = pi * radius
    print('Area of circle with radius %d = %.2f'%(num,area_of_circle))
    num+=1

Output

Area of circle with radius 1 = 3.14
Area of circle with radius 2 = 12.56
Area of circle with radius 3 = 28.26
Area of circle with radius 4 = 50.24
Area of circle with radius 5 = 78.50
Area of circle with radius 6 = 113.04
Area of circle with radius 7 = 153.86
Area of circle with radius 8 = 200.96
Area of circle with radius 9 = 254.34
Area of circle with radius 10 = 314.00

Example 7 : Asking user to input name and printing it for 5 times

name = input('Enter your name : ')
count = 1
while count <= 5:
    print('[%d]Your Name:%s'%(count,name))
    count+=1

Output

Enter your name : Kobe Bryant
[1]Your Name:Kobe Bryant
[2]Your Name:Kobe Bryant
[3]Your Name:Kobe Bryant
[4]Your Name:Kobe Bryant
[5]Your Name:Kobe Bryant

Example 8 : Asking user to input any 5 numbers and calculating square of each number and displaying the result

count = 0
num = [0,0,0,0,0]
print('Please enter any 5 numbers')
while count <= 4:
    num[count] = int(input('Enter number : '))
    count += 1
count = 0
print('Calculating Square of each number')
while count <= 4:
    val = num[count]
    sqr = val*val
    print('Square of %d is %d'%(val,sqr))
    count += 1

Output

Please enter any 5 numbers
Enter number : 2
Enter number : 3
Enter number : 4
Enter number : 5
Enter number : 6
Calculating Square of each number
Square of 2 is 4
Square of 3 is 9
Square of 4 is 16
Square of 5 is 25
Square of 6 is 36

Example 9 : Asking user to input any string and then displaying each character of a string.

str = input("Enter any string : ")
l = len(str)
count = 0
while count <= l-1:
    print(str[count])
    count += 1

Output

Enter any string : New York
N
e
w
 
Y
o
r
k

Example 10 : Asking user to input string and displaying characters in reverse order

str = input("Enter any string : ")
l = len(str)
count = 1
while count <= l:
    print(str[-count])
    count += 1

Output

Enter any string : New York
k
r
o
Y
 
w
e
N