Increment in Rust 1.55

In Rust 1.55, we can use the increment operator += to increment a number.

Here's an example:

fn main() {
    let mut num = 5;
    num += 1;
    println!("After increment, num is {}", num);
}

In this example, we first initialize a mutable variable num to 5. We then use the += operator to increment num by 1. Finally, we print the resulting value of num using println!.

Another example:

fn main() {
    let mut count = 0;
    for i in 0..5 {
        count += 1;
        println!("Count is now {}", count);
    }
}

In this example, we use a for loop to iterate over the values in a range from 0 to 4. In each iteration of the loop, we increment the mutable variable count using +=, and then print out its value.

The output of this program will be:

Count is now 1
Count is now 2
Count is now 3
Count is now 4
Count is now 5

This shows how the increment operator can be used to update a variable's value repeatedly in a loop.