Branching with if-else is similar to C. Unlike C, the boolean condition doesn't
need to be surrounded by parentheses, and each condition is followed by a
block. If-else conditionals are expressions too, and, because of Rust's type
safety, all branches must return the same type.
fn main() {
let n = 5i32;
if n < 0 {
print!("{} is negative", n);
} else if n > 0 {
print!("{} is positive", n);
} else {
print!("{} is zero", n);
}
let big_n =
if n < 10 && n > -10 {
println!(", and is a small number, increase ten-fold");
// This expression returns an `int`
10 * n
} else {
println!(", and is a big number, reduce by two");
// This expression must return an `int` as well
n / 2
// TODO ^ Try suppressing this expression with a semicolon
};
// ^ Don't forget to put a semicolon here! All the `let` bindings need it
println!("{} -> {}", n, big_n);
}