Question

BIS115.

How many different repetition structures does Python support?

What are the major differences between them?

Answer 1

python supports 2 repetition structures.

repetition structures in the sense with in the block of code executed repeatedly.

1)condition controlled

2)count controlled

1)condition controlled in the sense while loop.

based on the condition while loop iterates.the while loop iterates until the condition must be satisfied.

ex:

i=0

while( i != 1):

print("hi")

#output:first here i initialize with 0 so later go to next statement while(0!=1):

so the condition is correct so enter into loop and print("hi") again go back to while(0!=1):

condition satisfied so again print "hi" so again go its prints infinity time there is no end.

so we must give condition when the while loop stops.if we want stop the loop we must add condition

satisfied.

ex: to stop the repetition

i=0

while( i != 1):

print("hi")

i=1

so we add one statement so first i=0 so enter into loop and print "hi" later statement i=1.

so i changes 0 to 1. so present i=1

while(1!=1):

its false so terminate the loop only output is "hi"

2)count controlled in the sense its based on the count.example for loop we give particular count the loop run.

ex:

for i in range(1,10,1):

print(i)

output:

1 2 3 4 5 6 7 8 9

for(start,end,increment):

for take 3 parameters first one where we start second where we end third one which kind of skip we need

for starting with 1 and ending number is 10 increment 1

first print 1

later increment 1

print 2

later increment 1

so print 2+1=3

so print 3

until we reach the 10.

when we i reaches 10 the loop terminates.

this is the for loop.

it wan count controlled

major difference is condition controlled terminates based on the condition

count controlled terminates based on the count.

#if you have any doubts comment below.if you like give thumsup...