3rd_fibonacci_series

 n=int(input("Enter a number up to generate fibonacci series: "))

a=0

b=1

while a<n:

    print(a,end=" ")

    c=a+b

    a=b#the value of a is updated to be equal to the value of b

    b=c#the value of b is updated to be equal to the value of c

'''teration 1:

    a = 0

    b = 1

    Since 0 < 20, the condition is true.

    Output: 0

Iteration 2:

    a = 1

    b = 1

    Since 1 < 20, the condition is true.

    Output: 1

Iteration 3:

    a = 1

    b = 2

    Since 1 < 20, the condition is true.

    Output: 1

Iteration 4:

    a = 2

    b = 3

    Since 2 < 20, the condition is true.

    Output: 2

Iteration 5:

    a = 3

    b = 5

    Since 3 < 20, the condition is true.

    Output: 3

Iteration 6:

    a = 5

    b = 8

    Since 5 < 20, the condition is true.

    Output: 5

Iteration 7:

    a = 8

    b = 13

    Since 8 < 20, the condition is true.

    Output: 8

Iteration 8:

    a = 13

    b = 21

    Since 13 < 20, the condition is true.

    Output: 13

Iteration 9:

    a = 21

    b = 34

    Since 21 is not less than 20, the condition is false.'''