Page 233 - Computer Science V2.0 Class 11

num = 25
def function():
# Global Variable-num
print("Number (Global variable) inside function:", num)
x = 10
# Local Variable-x
print("Local Variable x:", x)
result = sqrt(num) + x

print("Number outside function before call:", num)
function()
print("Number outside function after call:", num)
7. Does a function always return a value? Explain with an example.
Ans. Yes. When the return statement is explicitly used in a function, the function returns the result of the computation to the statement that
invoked the function. In absence of any explicit return statement, by default, the function returns None value. For example:
def areaCircle(radius):
area = 3.14 * radius ** 2
return area

returnedVal = areaCircle(5)
print("Value returned by areaCircle", returnedVal)

def pattern(n):
for i in range(1, n+1):
print("*" * i)

returnedVal = pattern(5)
print("Value returned by pattern", returnedVal)

Output:
Value returned by areaCircle 78.5
*
**
***
****
*****
Value returned by pattern None

ACTIVITY-BASED QUESTIONS
Note: Writing a program implies:
● Adding comments as part of documentation
● Writing function definition
● Executing the function through a function call
1. To secure your account, whether it be an email, online bank account or any other account, it is important that we use authentication. Use
your programming expertise to create a program using user defined function named login that accepts userid and password as
parameters (login(uid,pwd)) that displays a message "account blocked" in case of three wrong attempts. The login is successful if
the user enters user ID as "ADMIN" and password as "St0rE@1". On successful login, display a message "login successful".

Introduction to Functions 219