/****************************************************************************************************
* date :JUNE 28, 2025
* author :A.E.
* prog_name :FIBONACCI
*
* filename: :fibonacci.rs
*
* comment : The CPU in a virtualization is so limited, my hardware has capability to do the
* task but the virualization limits the CPU speed and it takes forever to compute
* even the 40 Fibonacci sequence it is a large number but in this program I just
* u32 (unsigned 32-bit with range of 0-2,147,483,647) data type it has decent large
* number capacity but in this modern day computing it is just piece of shit
* It gets error in 47TH Fibinacci sequence 'cause it reach its limit you could
* change into 64-bit to accept larger number.
*
* The 32-bit integer is the sole culprit that's why in year 2038 our cpu time must be
* fixed or else it will gets error because the unix time started counting seconds
* from January 1, 1971 and will last until January 19, 2038 that if there is Y2K bug
* in year 200 there will be Y2K38 in 1938. There are a lots of system will be
* affected even the timestamps of some File System Existing today we have time but it
* will surely cost money, because of that. Even the old satellite will be affected we
* overlook those bug, and everything now is starting to migrate 64bit in system which
* people nowadays considered it overkill
*
* And it is also the culprit that's why we even use all the IPv4 addresses in the world
* because it also tailored in a 32-bit data type system.
*
* That why IPv6 is there can handle billions of hosts but it could be a problem for
* the people of future. Back then nobody thinks that 32-bit will never be enough.
*
* We are all thinking that 64-bit is enough but the future people I would like to
* thinkit will not be enough for them. Back in 1960's 5 MB (Megabytes) is insane size o
* f storage nobody back then think it will be full. But today a single picture taken from
* a cellphone camera can have a size of 20 Megabytes or more.
*
*
* ***************************************************************************************************/
use std::io;
use std::io::Write;
fn fibonacci(n: u32) -> u32 {
match n {
0 => 1,
1 => 1,
_=> fibonacci(n-1) + fibonacci(n-2),
}
}
fn main(){
println!("Fibonacci generator");
println!("Type \"quit\" to exit");
loop{
let mut n = String::new();
print!("Enter positive integer: ");
io::stdout().flush().unwrap();
io::stdin().read_line(&mut n).expect("Failed to read Line");
println!();
if n.trim() == "quit" { break; }
let n: u32 = match n.trim().parse() {
Ok(num) => num,
Err(_) => continue,
};
println!("{}", fibonacci(n));
}
}
