In this tutorial, we will learn about if statements in Rust. We will cover the basics of conditional execution using if statements.
An if statement is a conditional statement that executes a block of code if a specified condition is true.
The syntax for the if statement in Rust is:
if condition {
// Code block to execute if condition is true
}
The if statement evaluates the specified condition. If the condition is true, the code block inside the if statement is executed; otherwise, it is skipped.
The following is the flowchart of how execution flows from start to the end of an if statement.
num
.num
.num
is even.num
is even or not.fn main() {
let num = 10;
if num % 2 == 0 {
println!("{} is even.", num);
}
}
10 is even.
str
.str
.str
starts with a specific value.fn main() {
let str = "Hello, world!";
if str.starts_with("Hello") {
println!("String starts with 'Hello'.");
}
}
String starts with 'Hello'.
num
.num
.num
is positive.num
is positive or not.fn main() {
let num = -5;
if num > 0 {
println!("{} is positive.", num);
}
}