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How to swap two numbers in Scala
Theodore Kelechukwu OnyejiakuOverview
Swapping of variables is when we assign the value of one variable to another programmatically. In this shot, we'll see how we can swap the value of one variable with another, since there is no default method that can allow us to do this.
There are basically two ways to achieve this:
- With a third variable
- Without a third variable
Let's see these possibilities in the syntax below.
Syntax
c = a; a = b; b = c;
Syntax to swap two variables using third variable
a = a + b; b = a - b; a = a - b;
Syntax to swap two number variables without a third variable
Parameters
c: This is the third variable.
b: This is the second number variable.
a: This is the first number variable.
Examples
We'll see swapping with and without using a third variable.
With third variable
object Main extends App {
var a = 5
var b = 10
// print values before swapping
println("Before Swapping a = " +a+ " b =" +b)
// swap
var c = a
a = b
b = c
// print the values after swapping
println("After Swapping a = " +a+ " b =" +b)
}Swap variable values with a third variable
Explanation
- Lines 2–3: We create our two number variables and initialize them.
- Line 6: We print the values before swapping.
- Line 9–11: We swap the variable values using a third variable,
c. - Line 14: We finally print the swapped values.
Without third variable
object Main extends App {
var a = 5
var b = 10
// print values before swapping
println("Before Swapping a = " +a+ " b =" +b)
// swap
a = a + b
b = a - b
a = a - b
// print the values after swapping
println("After Swapping a = " +a+ " b =" +b)
}Swap number values without a third variable in Scala
Explanation
- Line 2–3: We create our two number variables and initialize them.
- Line 6: We print the values before swapping.
- Line 9–11: We swap the variable values without using any third variable.
- Line 14: We finally print the swapped values.
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