Swapping variable values also referred as swapping variables.
To swap variables, we need to follow the below steps:
- Assign x to a temporary variable say suppose
temp = x - Assign
ytoxas we backup ofxintemp, so if value ofxis changed we still have it intemp. Sox = y. - Assign
temptoyas we already have backup of old value ofxintemp, so we’ll update the value ofywithtempi.e an old value ofx. Soy = temp
In this article we’ll see how to swap values. Let us understand also with an example.
Logic to manually swap values in 2 variables
temp = x
x = y
y = tempBut here we’ve to use third variable to swap variables.
Program for swapping values in 2 variables
# Swapping values
x = input('Enter value for x: ')
y = input('Enter value for y: ')
print('---- Before Swapping ----')
print('X:', x)
print('Y:', y)
# Swapping logic
temp = x # storing x in temp
x = y # storing y in x
y = temp # storing temp in y
print('---- After Swapping ----')
print('X:', x)
print('Y:', y)Output
Enter value for x: Hello
Enter value for y: World
---- Before Swapping ----
X: Hello
Y: World
---- After Swapping ----
X: World
Y: HelloShorter way to swap values
- Python also provides a shorter way to swap variables.
- We need to pass comma separated operands(value, variable or expression)
- Python also allows to swap more than 2 operands.
Syntax
x, y = y, xProgram for swapping values in shorter way
# Swapping Values
x = input('Enter value for x: ')
y = input('Enter value for y: ')
print('---- Before Swapping ----')
print('X:', x)
print('Y:', y)
# Swapping
x, y = y, x
print('---- After Swapping ----')
print('X:', x)
print('Y:', y)Output
Enter value for x: 24
Enter value for y: 12
---- Before Swapping ----
X: 24
Y: 12
---- After Swapping ----
X: 12
Y: 24Program for swapping more than 2 values in shorter way
# Swapping Values
x = input('Enter value for x: ')
y = input('Enter value for y: ')
z = input('Enter value for z: ')
print('---- Before Swapping ----')
print('X:', x)
print('Y:', y)
print('Z:', z)
# Swapping
x, y, z = z, x, y
print('---- After Swapping ----')
print('X:', x)
print('Y:', y)
print('Z:', z)Here x, y, z = z, x, y will swap value in specified order, i.e at the last x will have old value of z, y will have old value of x and z will have old value of y
Output
Enter value for x: 24.12
Enter value for y: 100.2
Enter value for z: 57.6
---- Before Swapping ----
X: 24.12
Y: 100.2
Y: 57.6
---- After Swapping ----
X: 57.6
Y: 24.12
Z: 100.2Program for swapping with static value
# Swapping Values
x = 8
print('---- Before Swapping ----')
print('X:', x)
# Swapping
x, y = 45, x
print('---- After Swapping ----')
print('X:', x)
print('Y:', y)Output
---- Before Swapping ----
X: 8
---- After Swapping ----
X: 45
Y: 8Hope you like this!
Keep helping and happy 😄 coding
