Absolute value function in Rust - function

Question

In this elementary Rust program a function calculates the absolute value of an integer, and main() helps in completing a statement with the result:
fn main() {
let value = abs(-4);
println!("{}.", value);
}
fn abs(x: i32) -> i32 {
print!("The abs value of {} is ", x);
if x > 0 {
return x;
} else {
-x
}
}
Is there a way to print correctly the whole statement "The abs value of... is..." into the abs() function? I tried unsuccessfully with
println!("The abs value of {} is {} ", x, x);
This always prints the value of the x parameter (e.g. -4, -4) so it's not correct.
And with
println!("The abs value of {} is {} ", x, abs(x));
But here, for some reason, Rust is not happy with recursion, gives a warning at compilation and then doesn't run the program.

Answer 1

The absolute value method is already defined; you do not need to implement it yourself
fn main() {
let value = abs(-4);
println!("{}.", value);
}
fn abs(x: i32) -> i32 {
let val = x.abs();
println!("The abs value of {} is {}", x, val);
val
}

Answer 2

Try this to avoid recursion:
fn main() {
let value = abs(-4);
println!("{}.", value);
}
fn abs(x: i32) -> i32 {
let y = if x >= 0 { x } else { -x };
println!("The abs value of {} is {} ", x, y);
y
}
Output:
The abs value of -4 is 4
4.
There are built-in .abs() method for primitive types e.g.
i8,
i16,
i32,
i64,
i128,
f32,
and f64:
assert_eq!(10i32.abs(), 10);
assert_eq!((-10i32).abs(), 10);
Overflow behavior
The absolute value of i32::min_value() cannot be represented as an
i32, and attempting to calculate it will cause an overflow. This
means that code in debug mode will trigger a panic on this case and
optimized code will return i32::min_value() without a panic.
The following code, will panic in debug mode (and returns -128 in release mode):
fn main() {
let a = -128_i8;
println!("{}", a); // -128
let b = a.abs();
println!("{}", b); // -128
}
Since abs(-2_147_483_648_i32) is 2_147_483_648_u32, you may return u32 instead of i32:
fn abs(x: i32) -> u32 {
if x >= 0 {
x as u32
} else if x == std::i32::MIN {
2_147_483_648_u32
} else {
-x as u32
}
}
fn main() {
let value = abs(std::i32::MIN); // i32::min_value() // -2_147_483_648i32
println!("{}.", value); // 2147483648
}
Output:
2147483648