CODEWITHSUNDEEP
python
Darshan Asknani
Darshan Asknani

Reputation: 1

Why does this python code not swap the numbers?

Why does this python code not swap the numbers?

def swap(x, y):
    '''THe swap function'''
    print("INSIDE")
    temp = x
    x = y
    y = temp


#Driver_code
x = 2
y = 3
swap(x, y)
print(x)
print(y)

Upvotes: 0

Views: 72

Answers (3)

Nishani Kasineshan
Nishani Kasineshan

Reputation: 682

The swap function is not returning values

def swap(x, y):
    '''THe swap function'''
    print("INSIDE")
    temp = x
    x=y
    y= temp
    return x,y


#Driver_code
x = 2
y = 3
x,y=swap(x, y)
print(x)
print(y)

Here, you assign the returning values to x and y.

Upvotes: 0

rkechols
rkechols

Reputation: 577

Because the swap is inside the function.

You're swapping the values of the function parameters x and y, which are different from the x and y that are used below.

Just do this:

x, y = y, x

Upvotes: 0

Manjothi Anas Abdul Gani
Manjothi Anas Abdul Gani

Reputation: 59

In the Swap function add this one line:

global x,y;

The problem is when you are calling the swap() function it is making its own variable x and y, not using the global variable x and y

Upvotes: 1

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