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authorAdam Carpenter <gitlab@53hor.net>2019-07-09 15:14:04 -0400
committerAdam Carpenter <gitlab@53hor.net>2019-07-09 15:14:04 -0400
commit7e8ee5ed9cad6484e9f13f81731b102ced58402e (patch)
tree5395402ab07bbb5a659dbd68c701e22a1227202f /rust-book/fibonacci/src
downloadlearning-rust-7e8ee5ed9cad6484e9f13f81731b102ced58402e.tar.xz
learning-rust-7e8ee5ed9cad6484e9f13f81731b102ced58402e.zip
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Diffstat (limited to 'rust-book/fibonacci/src')
-rwxr-xr-xrust-book/fibonacci/src/main.rs31
1 files changed, 31 insertions, 0 deletions
diff --git a/rust-book/fibonacci/src/main.rs b/rust-book/fibonacci/src/main.rs
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+++ b/rust-book/fibonacci/src/main.rs
@@ -0,0 +1,31 @@
+use std::env;
+
+fn fib(n: u32) -> u32 {
+
+ if n == 0 || n == 1 {
+ return n;
+ }
+ else {
+ return fib(n - 1) + fib(n - 2);
+ }
+
+}
+
+fn main() {
+ // grab iterations
+ let iterations: u32 = match env::args().nth(1) {
+ Some(s) => {
+ let attempt: u32 = s.trim().parse()
+ .expect("error: could not parse iterations");
+ attempt
+ },
+ None => {
+ eprintln!("error: usage: fibonacci [iterations]");
+ return;
+ },
+ };
+
+ for i in 0..iterations {
+ println!("{}", fib(i));
+ }
+}