While Loop in Python
While Loop
While loop is entry control loop.Disadvantage of “For” loop is we cannot use condition in the loop. In python , if we need a loop which works on condition then we go with while loop. Also if we need an infinite loop we can use while loop.
While Loop in Python
A while loop in Python is used to repeatedly execute a block of code as long as a specified condition is True. The loop continues executing as long as the condition remains True, and it terminates when the condition becomes False.
Syntax of While loop
while(condition):
#statements
Syntax of infinite while loop
while(True):
#statements
(or)
while(1):
#statements
Working
- Step 1: Take while loop with a condition
- Step 2: Evaluate expression in Boolean form
- Step 3: If boolean condition is True then it go inside the loop , if boolean condition is False then it terminates the loop
- Step 4: It execute the statements inside the loop
- Step 5: Step 3 is repeated until the condition becomes False.
Python Code:
a=1
b=10
#loop with True condition
while(a<=b):
print(a,end=" ")
a+=1 #for incrementing a
print("\nValues at the point of terminating loop are : a={} and b={}".format(a,b))
Output: 1 2 3 4 5 6 7 8 9 10 Values at the point of terminating loop are : a=11 and b=10
Nested While loop
#printing a box pattern using nested while loop
i,n=0,5
while(i < n):
j=0
while(j < n):
print("*",end=" ")
j+=1
i+=1
print()
Output: * * * * * * * * * * * * * * * * * * * * * * * * *
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