You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

57 lines
1.4 KiB

2 years ago
struct Num { rdigits: Vec<u8> }
impl Num {
pub fn from(s: &String) -> Num {
let rd: Vec<u8> = s.chars().rev()
.map(|c| String::from(c).parse::<u8>().unwrap())
.collect();
Num { rdigits: rd }
}
pub fn add(&self, n: &Num) -> Num {
let mut xs = self.rdigits.clone();
let mut ys = n.rdigits.clone();
let mut rs: Vec<u8> = Vec::new();
while xs.len() < ys.len() { xs.push(0); }
while ys.len() < xs.len() { ys.push(0); }
let mut rm = 0u8;
for (a, b) in xs.iter().zip(ys.iter()) {
if a + b + rm > 9 {
rs.push((a + b + rm) - 10);
rm = 1u8;
} else {
rs.push(a + b + rm);
rm = 0u8;
}
}
if rm > 0 { rs.push(1u8); }
Num { rdigits: rs }
}
pub fn len(&self) -> usize { self.rdigits.len() }
pub fn print(&self) {
for c in self.rdigits.iter().rev() { print!("{}", c); };
println!("");
}
}
fn main() {
let mut fa = Num::from(&String::from("1"));
let mut fb = Num::from(&String::from("1"));
let mut i = 2;
let l = 1000usize;
while fb.len() < l {
let fc = fa.add(&fb);
fa = fb;
fb = fc;
i += 1;
}
fb.print();
println!("-----------");
println!("[{}]", i);
}