Page 313 - Computer Science V2.0 Class 11

The control then skips the remaining statements in the loop (even though all the values in the range have not been
traversed) and moves to the statement immediately following the loop (print ("Over")).
In the example of while loop, the break statement is encountered when the value of num is 3. Therefore, the loop
terminates and the control shifts to the statement, print("Done").
If the break statement is inside a nested loop, the innermost loop is terminated and the control shifts to the
immediate outer loop.

Program 11.8 Write a function prime(n) to check whether a number is prime number or not.

01 def prime(n):
02 '''
03 objective: To check whether a number is prime.
04 inputs:
05 n: the number to be tested for primeness
06 output:
07 The message indicating whether n is prime
08 Return Value: None
09 '''
10 #Approach: Given n is prime if it is not divisble
11 # by any integer in range(2, n)
12 upperLimit = n
13 for i in range(2, n):
14 if n%i == 0:
15 print(n, '=', i, '*', n//i)
16 #i divides n
17 break
18 else:
19 print(n, 'is a prime number')
Sample Output:

>>> prime(12)
12 = 2 * 6
>>> prime (8)
8 = 2 * 4
>>> prime(29)
29 is a prime number
>>> prime(13)
13 is a prime number
>>> prime(91)
91 = 7 * 13

In program 11.8, for each value of i, the condition n % i == 0 is evaluated. If the condition n % i == 0 holds, the break
statement gets executed and the control exits the inner for-loop. Because of the abrupt exit from the for-loop on the
execution of the break statement, the else clause in the inner for-loop does not get executed. However, if for a given
value of n, n % i == 0 does not hold for any value of i in range(2, n), then the n must be a prime. In this case, the
else part of the inner for-loop is executed, and a message is displayed that it is a prime number.

11.5.2 continue Statement
Continue statement is also a jump statement, just like the break statement. When a continue statement is
encountered, the remaining statement(s) in the loop is skipped and the control jumps to the beginning of the loop for
the next iteration. The flowchart in Fig 11.5 illustrates the working of continue statement.
Syntax:

continue

Looping in Python 299