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Break statement | Continue | Else for loop | nested loops

Prasanna Kalathy K

August 7, 2021

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we have seen what are loops?

types of loops?

what is for loop? and range function also what is a while loop?

In a while loop, we are having 2 jumping statements

1. Break
2. Continue

The break Statement

A break statement terminates the loop in which it is present.

Regardless of the following statements. that is the remaining statements in that particular loop won’t take into account the execution. 

Execution resumes at the statement immediately following the body of the terminated statement loop.

In conclusion, A break statement skips the rest of the loop and jumps over to the statement following the loop 

Explanation:

Example:

a=b=c=0
for i in range(1,11):
    a=int(input ("Enter number 1 :")) 
    b=int(input ("Enter number 2 :"))
    if b == 0:
        print("Division by zero error!")
        break
else:
    c= a/b
    print("Quotient",c)
print("Program over !")

Output

Enter number 1 :6
Enter number 2 :0
Division by zero error!
Program over !

The Contiue Statement

The continue statement forces the next iteration of the loop to take place, skipping any code in between.it’s different from the break statement

The continue statement skips the rest of the loop statements and causes the next iteration of the loop to take place

Explanation:

Example:

for a in "word":
    if a == "r":
        continue
    print(a)

print("The end")

Output

w
o
d
The end

Here we are continuing the loop if the string is “r” which will not be executing the rest of the code. so, we will get our output with all the letters except r

More operations on loops:

there are few different operations for our loops

• loop with else statement
• nested loops

Loops with Else statement

In python, loops can also have else statements like the same for of else statements

let’s see how to use else for the loops statements

Syntax for for loop else statement

for <variable> in <sequence> :
statement1
Statement
:
else :
statement(s)

Syntax for While loop else statement

while <test condition :
statement1
statement2
:
:
else:
statement(s)

How the else statement used for loops ??

The else part of the Python loop will execute when the loop terminates normally,

for example, when

the test-condition results will give false for a while loop or in case of for loop has executed the last value in the given sequence not when the break statement terminates the loop.

Example

for a in range (1, 4) :
    if a % 8 == 0 :
        break
    print("Number is", end = ' ')
    print(a)
else:
    print("Ending loop after printing all Numbers of sequence")

Output

Number is 1
Number is 2
Number is 3
Ending loop after printing all Numbers of sequence

Explanation

from the above code, the last line of the output is printed because the else part of giving for loop executed when the for loop was terminated

In case we gave %2 instead of %8 we will get the following as output

Number 1 

Nested loops

A loop may contain another loop in its body. This form of a loop is called a nested loop. But in a

nested loop, the inner loop must terminate before the outer loop.

Example

for i in range(1, 6):
    for j in range (1, i):
        print("*", end =' ')
print()

Output

* * * * * * * * * * 

In nested loops, a break statement will terminate the very loop it appears in.

If the break statement is inside the inner loop, then only the inner loop will terminate and the outer loop will continue.

 If however, the break statement is in the outer loop, the outer loop will terminate.